« Indice humidex » : différence entre les versions
Vandalisme |
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Ligne 20 : | Ligne 20 : | ||
: T<sub>rosee</sub> est le [[point de rosée]] (degré Celsius) |
: T<sub>rosee</sub> est le [[point de rosée]] (degré Celsius) |
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{| class="wikitable" style="text-align: center; height: 200px; |
{| class="wikitable" style="text-align: center; height: 200px;" |
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|+ Indice Humidex |
|+ Indice Humidex |
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|- |
|- |
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| rowspan=2 colspan=2 | |
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| colspan=17 | Température (°C) |
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|- |
|- |
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! scope="col" | 15 |
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! 15 !! 16 !! 17 !! 18 !! 19 !! 20 !! 21 !! 22 !! 23 !! 24 !! 25 !! 26 !! 27 !! 28 !! 29 !! 30 !! 31 !! 32 !! 33 !! 34 !! 35 !! 36 !! 37 !! 38 !! 39 !! 40 !! 41 !! 42 !! 43 |
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! scope="col" | 20 |
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! scope="col" | 25 |
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! scope="col" | 30 |
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! scope="col" | 31 |
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! scope="col" | 32 |
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! scope="col" | 33 |
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! scope="col" | 34 |
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! scope="col" | 35 |
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! scope="col" | 36 |
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! scope="col" | 37 |
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! scope="col" | 38 |
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! scope="col" | 39 |
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! scope="col" | 41 |
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! scope="col" | 42 |
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! scope="col" | 43 |
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|- |
|- |
||
| rowspan=14 | Point de rosée <br/>(°C) |
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|- |
|- |
||
! 10 |
! scope="row" | 10 |
||
| style="background: |
| style="background: green" | 16 || style="background: green" | 21 || style="background: green" | 26|| style="background: yellow" | 31 || style="background: yellow" | 32 || style="background: yellow" | 33 || style="background: yellow" | 34|| style="background: yellow" | 35 || style="background: yellow" | 36|| style="background: yellow" | 37|| style="background: yellow" | 38|| style="background: yellow" | 39|| style="background: orange" | 40|| style="background: orange" | 42 || style="background: orange" | 43 || style="background: orange" | 44 |
||
|- |
|- |
||
! scope="row" | 15 |
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! 11 |
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| style="background: |
| style="background: green" | 19 || style="background: green" | 24 || style="background: green" | 29 || style="background: yellow" | 34 || style="background: yellow" | 35 || style="background: yellow" | 36 || style="background: yellow" | 37 || style="background: yellow" | 38 || style="background: yellow" | 39 || style="background: orange" | 40 || style="background: orange" | 41 || style="background: orange" | 42 || style="background: orange" | 43 || style="background: orange" | 45 || style="background: red" | 46 || style="background: red" | 47 |
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|- |
|- |
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! scope="row" | 20 |
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! 12 |
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| style="background: |
| style="background: white" | || style="background: green" | 28 || style="background: yellow" | 33|| style="background: yellow" | 38|| style="background: yellow" | 39 || style="background: orange" | 40 || style="background: orange" | 41 || style="background: orange" | 42 || style="background: orange" | 43 || style="background: orange" | 44 || style="background: orange" | 45 || style="background: red" | 46 || style="background: red" | 47 || style="background: red" | 49 || style="background: red" | 50 || style="background: red" | 51 |
||
|- |
|- |
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! scope="row" | 23 |
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! 13 |
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| style="background: |
| style="background: white" | || style="background: white" | || style="background: yellow" | 35 || style="background: orange" |40 || style="background: orange" | 41 || style="background: orange" | 42 || style="background: orange" | 43 || style="background: orange" | 44 || style="background: orange" | 45 || style="background: red" | 46 || style="background: red" | 47 || style="background: red" | 48 || style="background: red" | 49 || style="background: red" | 51 || style="background: red" | 52 || style="background: red" | 53 |
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|- |
|- |
||
! scope="row" | 24 |
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! 14 |
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| style="background: |
| style="background: white" | || style="background: white" | || style="background: yellow" |36 || style="background: orange" | 41 || style="background: orange" | 42 || style="background: orange" | 43 || style="background: orange" | 44 || style="background:orange" | 45 || style="background: red" | 46 || style="background: red" | 47 || style="background: red" | 48 || style="background: red" | 49 || style="background: red" | 50 || style="background: red" | 52|| style="background: red" | 53 || style="background: red" | 54 |
||
|- |
|- |
||
! scope="row" | 25 |
|||
! 15 |
|||
| style="background: |
| style="background: white" | || style="background: white" | || style="background: white" | || style="background: orange" | 42 || style="background: orange" | 43 || style="background: orange" | 44 || style="background: orange" | 45 || style="background:red" | 46 || style="background: red" | 47 || style="background: red" | 48 || style="background: red" | 49 || style="background: red" | 50 || style="background: red" | 51 || style="background: red" | 53|| style="background: red" | 54 || style="background: red" | 55 |
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|- |
|- |
||
! scope="row" | 26 |
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! 16 |
|||
| style="background: white" | || style="background: white" | || style="background: white" | || style="background: orange" | 43 || style="background: orange" | 44 || style="background: orange" | 45 || style="background: red" | 46 || style="background:red" | 47 || style="background: red" | 48 || style="background: red" | 49 || style="background: red" | 50 || style="background: red" | 51 || style="background: red" | 52 || style="background: red" | 54 || style="background: red" | 55 || style="background: red" | 56 |
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|- |
|- |
||
! scope="row" | 27 |
|||
! 17 |
|||
| style="background: white" | || style="background: white" | || style="background: white" | || style="background: orange" | 45 || style="background: red" | 46 || style="background: red" | 47 || style="background: red" | 48|| style="background:red" | 49 || style="background: red" | 50 || style="background: red" | 51 || style="background: red" | 52 || style="background: red" | 53 || style="background: red" | 54 || style="background: red" | 56 || style="background: red" | 57 || style="background: red" | 58 |
|||
|- |
|- |
||
! scope="row" | 28 |
|||
! 18 |
|||
| style="background: white" | || style="background: white" | || style="background: white" | || style="background: red" | 46|| style="background: red" | 47 || style="background: red" | 48 || style="background: red" | 49|| style="background:red" | 50|| style="background: red" | 51 || style="background: red" | 52 || style="background: red" | 53 || style="background: red" | 54 || style="background: red" | 55 || style="background: red" | 57 || style="background: red" | 58 || style="background: red" | 59 |
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|- |
|- |
||
! 19 |
|||
| – || – || – || – || style="background: limegreen" | 26 || style="background: limegreen" | 27 || style="background: limegreen" | 28 || style="background: limegreen" | 29 || style="background: yellow" | 30 || style="background: yellow" | 31 || style="background: yellow" | 32 || style="background: yellow" | 33 || style="background: yellow" | 34 || style="background: yellow" | 35 || style="background: yellow" | 36 || style="background: yellow" | 37 || style="background: yellow" | 38 || style="background: yellow" | 39 || style="background: darkorange" | 40 || style="background: darkorange" | 41 || style="background: darkorange" | 42 || style="background: darkorange" | 43 || style="background: darkorange" | 44 || style="background: darkorange" | 45 || style="background: red; color: white" | 46 || style="background: red; color: white" | 47 || style="background: red; color: white" | 48 || style="background: red; color: white" | 49 || style="background: red; color: white" | 50 |
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|- |
|||
! 20 |
|||
| – || – || – || – || – || style="background: limegreen" | 28 || style="background: limegreen" | 29 || style="background: yellow" | 30 || style="background: yellow" | 31 || style="background: yellow" | 32 || style="background: yellow" | 33 || style="background: yellow" | 34 || style="background: yellow" | 35 || style="background: yellow" | 36 || style="background: yellow" | 37 || style="background: yellow" | 38 || style="background: yellow" | 39 || style="background: darkorange" | 40 || style="background: darkorange" | 41 || style="background: darkorange" | 42 || style="background: darkorange" | 43 || style="background: darkorange" | 44 || style="background: darkorange" | 45 || style="background: red; color: white" | 46 || style="background: red; color: white" | 47 || style="background: red; color: white" | 48 || style="background: red; color: white" | 49 || style="background: red; color: white" | 50 || style="background: red; color: white" | 51 |
|||
|- |
|||
! 21 |
|||
| – || – || – || – || – || – || style="background: limegreen" | 29 || style="background: yellow" | 30 || style="background: yellow" | 31 || style="background: yellow" | 32 || style="background: yellow" | 33 || style="background: yellow" | 34 || style="background: yellow" | 35 || style="background: yellow" | 36 || style="background: yellow" | 37 || style="background: yellow" | 38 || style="background: yellow" | 39 || style="background: darkorange" | 40 || style="background: darkorange" | 41 || style="background: darkorange" | 42 || style="background: darkorange" | 43 || style="background: darkorange" | 44 || style="background: darkorange" | 45 || style="background: red; color: white" | 46 || style="background: red; color: white" | 47 || style="background: red; color: white" | 48 || style="background: red; color: white" | 49 || style="background: red; color: white" | 50 || style="background: red; color: white" | 51 |
|||
|- |
|||
! 22 |
|||
| – || – || – || – || – || – || – || style="background: yellow" | 31 || style="background: yellow" | 32 || style="background: yellow" | 33 || style="background: yellow" | 34 || style="background: yellow" | 35 || style="background: yellow" | 36 || style="background: yellow" | 37 || style="background: yellow" | 38 || style="background: yellow" | 39 || style="background: darkorange" | 40 || style="background: darkorange" | 41 || style="background: darkorange" | 42 || style="background: darkorange" | 43 || style="background: darkorange" | 44 || style="background: darkorange" | 45 || style="background: red; color: white" | 46 || style="background: red; color: white" | 47 || style="background: red; color: white" | 48 || style="background: red; color: white" | 49 || style="background: red; color: white" | 50 || style="background: red; color: white" | 51 || style="background: red; color: white" | 52 |
|||
|- |
|||
! 23 |
|||
| – || – || – || – || – || – || – || – || style="background: yellow" | 33 || style="background: yellow" | 34 || style="background: yellow" | 35 || style="background: yellow" | 36 || style="background: yellow" | 37 || style="background: yellow" | 38 || style="background: yellow" | 39 || style="background: darkorange" | 40 || style="background: darkorange" | 41 || style="background: darkorange" | 42 || style="background: darkorange" | 43 || style="background: darkorange" | 44 || style="background: darkorange" | 45 || style="background: red; color: white" | 46 || style="background: red; color: white" | 47 || style="background: red; color: white" | 48 || style="background: red; color: white" | 49 || style="background: red; color: white" | 50 || style="background: red; color: white" | 51 || style="background: red; color: white" | 52 || style="background: red; color: white" | 53 |
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|- |
|||
! 24 |
|||
| – || – || – || – || – || – || – || – || – || style="background: yellow" | 35 || style="background: yellow" | 36 || style="background: yellow" | 37 || style="background: yellow" | 38 || style="background: yellow" | 39 || style="background: darkorange" | 40 || style="background: darkorange" | 41 || style="background: darkorange" | 42 || style="background: darkorange" | 43 || style="background: darkorange" | 44 || style="background: darkorange" | 45 || style="background: red; color: white" | 46 || style="background: red; color: white" | 47 || style="background: red; color: white" | 48 || style="background: red; color: white" | 49 || style="background: red; color: white" | 50 || style="background: red; color: white" | 51 || style="background: red; color: white" | 52 || style="background: red; color: white" | 53 || style="background: red; color: white" | 54 |
|||
|- |
|||
! 25 |
|||
| – || – || – || – || – || – || – || – || – || – || style="background: yellow" | 37 || style="background: yellow" | 38 || style="background: yellow" | 39 || style="background: darkorange" | 40 || style="background: darkorange" | 41 || style="background: darkorange" | 42 || style="background: darkorange" | 43 || style="background: darkorange" | 44 || style="background: darkorange" | 45 || style="background: red; color: white" | 46 || style="background: red; color: white" | 47 || style="background: red; color: white" | 48 || style="background: red; color: white" | 49 || style="background: red; color: white" | 50 || style="background: red; color: white" | 51 || style="background: red; color: white" | 52 || style="background: red; color: white" | 53 || style="background: red; color: white" | 54 || style="background: red; color: white" | 55 |
|||
|- |
|||
! 26 |
|||
| – || – || – || – || – || – || – || – || – || – || – || style="background: yellow" | 39 || style="background: darkorange" | 40 || style="background: darkorange" | 41 || style="background: darkorange" | 42 || style="background: darkorange" | 43 || style="background: darkorange" | 44 || style="background: darkorange" | 45 || style="background: red; color: white" | 46 || style="background: red; color: white" | 47 || style="background: red; color: white" | 48 || style="background: red; color: white" | 49 || style="background: red; color: white" | 50 || style="background: red; color: white" | 51 || style="background: red; color: white" | 52 || style="background: red; color: white" | 53 || style="background: red; color: white" | 54 || style="background: red; color: white" | 55 || style="background: red; color: white" | 56 |
|||
|- |
|||
! 27 |
|||
| – || – || – || – || – || – || – || – || – || – || – || – || style="background: darkorange" | 42 || style="background: darkorange" | 43 || style="background: darkorange" | 44 || style="background: darkorange" | 45 || style="background: red; color: white" | 46 || style="background: red; color: white" | 47 || style="background: red; color: white" | 48 || style="background: red; color: white" | 49 || style="background: red; color: white" | 50 || style="background: red; color: white" | 51 || style="background: red; color: white" | 52 || style="background: red; color: white" | 53 || style="background: red; color: white" | 54 || style="background: red; color: white" | 55 || style="background: red; color: white" | 56 || style="background: red; color: white" | 57 || style="background: red; color: white" | 58 |
|||
|- |
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! 28 |
|||
| – || – || – || – || – || – || – || – || – || – || – || – || – || style="background: darkorange" | 44 || style="background: darkorange" | 45 || style="background: red; color: white" | 46 || style="background: red; color: white" | 47 || style="background: red; color: white" | 48 || style="background: red; color: white" | 49 || style="background: red; color: white" | 50 || style="background: red; color: white" | 51 || style="background: red; color: white" | 52 || style="background: red; color: white" | 53 || style="background: red; color: white" | 54 || style="background: red; color: white" | 55 || style="background: red; color: white" | 56 || style="background: red; color: white" | 57 || style="background: red; color: white" | 58 || style="background: red; color: white" | 59 |
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|} |
|} |
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Ligne 96 : | Ligne 82 : | ||
}}</ref> : |
}}</ref> : |
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{| class="wikitable" style="text-align: center; height: 200px; |
{| class="wikitable" style="text-align: center; height: 200px;" |
||
|+ Indice Humidex |
|+ Indice Humidex |
||
|- |
|- |
||
| rowspan=2 colspan=2 | |
|||
| colspan=17 | Température (°C) |
|||
|- |
|||
! scope="col" | 21 |
|||
! scope="col" | 25 |
|||
! scope="col" | 30 |
|||
! scope="col" | 31 |
|||
! scope="col" | 32 |
|||
! scope="col" | 33 |
|||
! scope="col" | 34 |
|||
! scope="col" | 35 |
|||
! scope="col" | 36 |
|||
! scope="col" | 37 |
|||
! scope="col" | 38 |
|||
! scope="col" | 39 |
|||
! scope="col" | 40 |
|||
! scope="col" | 41 |
|||
! scope="col" | 42 |
|||
! scope="col" | 43 |
|||
|- |
|- |
||
| rowspan=14 | Humidité relative<br/>(%) |
|||
! 21 !! 25 !! 30 !! 31 !! 32 !! 33 !! 34 !! 35 !! 36 !! 37 !! 38 !! 39 !! 40 !! 41 !! 42 !! 43 |
|||
|- |
|- |
||
! scope="row" | 20 |
|||
! rowspan=14 | Humidité<br/>relative (%) |
|||
| style="background: white" | |
|||
| style="background: white" | |
|||
| style="background: white" | |
|||
| style="background: white" | |
|||
| style="background: white" | |
|||
| style="background: white" | |
|||
| style="background: white" | |
|||
| style="background: white" | |
|||
| style="background: white" | |
|||
| style="background: white" | |
|||
| style="background: orange" | 40 |
|||
| style="background: orange" | 41 |
|||
| style="background: orange" | 43 |
|||
| style="background: orange" | 44 |
|||
| style="background: red" | 46 |
|||
| style="background: red" | 47 |
|||
|- |
|- |
||
! scope="row" | 30 |
|||
! 20 |
|||
| style="background: white" | |
|||
| – || – || – || – || – || – || – || – || – || – || style="background: orange" | 40 || style="background: orange" | 41 || style="background: orange" | 43 || style="background: orange" | 44 || style="background: red" | 46 || style="background: red" | 47 |
|||
| style="background: white" | |
|||
| style="background: yellow" | 31 |
|||
| style="background: yellow" | 33 |
|||
| style="background: yellow" | 34 |
|||
| style="background: yellow" | 36 |
|||
| style="background: yellow" | 37 |
|||
| style="background: yellow" | 38 |
|||
| style="background: orange" | 40 |
|||
| style="background: orange" | 42 |
|||
| style="background: orange" | 43 |
|||
| style="background: orange" | 45 |
|||
| style="background: red" | 47 |
|||
| style="background: red" | 48 |
|||
| style="background: red" | 50 |
|||
| style="background: red" | 51 |
|||
|- |
|- |
||
! scope="row" | 40 |
|||
! 30 |
|||
| style="background: white" | |
|||
| – || – || style="background: yellow" | 31 || style="background: yellow" | 33 || style="background: yellow" | 34 || style="background: yellow" | 36 || style="background: yellow" | 37 || style="background: yellow" | 38 || style="background: orange" | 40 || style="background: orange" | 42 || style="background: orange" | 43 || style="background: orange" | 45 || style="background: red" | 47 || style="background: red" | 48 || style="background: red" | 50 || style="background: red" | 51 |
|||
| style="background: green" | 26 |
|||
| style="background: yellow" | 34 |
|||
| style="background: yellow" | 35 |
|||
| style="background: yellow" | 37 |
|||
| style="background: yellow" | 39 |
|||
| style="background: orange" | 40 |
|||
| style="background: orange" | 42 |
|||
| style="background: orange" | 44 |
|||
| style="background: orange" | 45 |
|||
| style="background: red" | 47 |
|||
| style="background: red" | 49 |
|||
| style="background: red" | 51 |
|||
| style="background: red" | 53 |
|||
| style="background: red" | 54 |
|||
| style="background: red" | 56 |
|||
|- |
|- |
||
! scope="row" | 50 |
|||
! 40 |
|||
| style="background: green" | 22 |
|||
| – || style="background: green" | 26 || style="background: yellow" | 34 || style="background: yellow" | 35 || style="background: yellow" | 37 || style="background: yellow" | 39 || style="background: orange" | 40 || style="background: orange" | 42 || style="background: orange" | 44 || style="background: orange" | 45 || style="background: red" | 47 || style="background: red" | 49 || style="background: red" | 51 || style="background: red" | 53 || style="background: red" | 54 || style="background: red" | 56 |
|||
| style="background: green" | 28 |
|||
| style="background: yellow" | 36 |
|||
| style="background: yellow" | 38 |
|||
| style="background: orange" | 40 |
|||
| style="background: orange" | 41 |
|||
| style="background: orange" | 43 |
|||
| style="background: orange" | 45 |
|||
| style="background: red" | 47 |
|||
| style="background: red" | 49 |
|||
| style="background: red" | 51 |
|||
| style="background: red" | 53 |
|||
| style="background: red" | 55 |
|||
| style="background: red" | 57 |
|||
| style="background: white" | |
|||
| style="background: white" | |
|||
|- |
|- |
||
! scope="row" | 60 |
|||
! 50 |
|||
| style="background: green" | 24 |
|||
| style="background: green" | 22 || style="background: green" | 28 || style="background: yellow" | 36 || style="background: yellow" | 38 || style="background: orange" | 40 || style="background: orange" | 41 || style="background: orange" | 43 || style="background: orange" | 45 || style="background: red" | 47 || style="background: red" | 49 || style="background: red" | 51 || style="background: red" | 53 || style="background: red" | 55 || style="background: red" | 57 || – || – |
|||
| style="background: yellow" | 30 |
|||
| style="background: yellow" | 38 |
|||
| style="background: orange" | 40 |
|||
| style="background: orange" | 42 |
|||
| style="background: orange" | 44 |
|||
| style="background: red" | 46 |
|||
| style="background: red" | 48 |
|||
| style="background: red" | 50 |
|||
| style="background: red" | 52 |
|||
| style="background: red" | 54 |
|||
| style="background: red" | 57 |
|||
| style="background: white" | |
|||
| style="background: white" | |
|||
| style="background: white" | |
|||
| style="background: white" | |
|||
|- |
|- |
||
! scope="row" | 70 |
|||
! 60 |
|||
| style="background: green" | 25 |
|||
| style="background: green" | 24 || style="background: yellow" | 30 || style="background: yellow" | 38 || style="background: orange" | 40 || style="background: orange" | 42 || style="background: orange" | 44 || style="background: red" | 46 || style="background: red" | 48 || style="background: red" | 50 || style="background: red" | 52 || style="background: red" | 54 || style="background: red" | 57 || – || – || – || – |
|||
| style="background: yellow" | 32 |
|||
| style="background: orange" | 41 |
|||
| style="background: orange" | 43 |
|||
| style="background: orange" | 45 |
|||
| style="background: red" | 47 |
|||
| style="background: red" | 49 |
|||
| style="background: red" | 51 |
|||
| style="background: red" | 53 |
|||
| style="background: red" | 56 |
|||
| style="background: red" | 58 |
|||
| style="background: white" | |
|||
| style="background: white" | |
|||
| style="background: white" | |
|||
| style="background: white" | |
|||
| style="background: white" | |
|||
|- |
|- |
||
! scope="row" | 80 |
|||
! 70 |
|||
| style="background: green" | 26 |
|||
| style="background: green" | 25 || style="background: yellow" | 32 || style="background: orange" | 41 || style="background: orange" | 43 || style="background: orange" | 45 || style="background: red" | 47 || style="background: red" | 49 || style="background: red" | 51 || style="background: red" | 53 || style="background: red" | 56 || style="background: red" | 58 || – || – || – || – || – |
|||
| style="background: yellow" | 33 |
|||
| style="background: orange" | 43 |
|||
| style="background: orange" | 45 |
|||
| style="background: red" | 47 |
|||
| style="background: red" | 50 |
|||
| style="background: red" | 52 |
|||
| style="background: red" | 54 |
|||
| style="background: red" | 57 |
|||
| style="background: red" | 59 |
|||
| style="background: white" | |
|||
| style="background: white" | |
|||
| style="background: white" | |
|||
| style="background: white" | |
|||
| style="background: white" | |
|||
| style="background: white" | |
|||
|- |
|- |
||
! scope="row" | 90 |
|||
! 80 |
|||
| style="background: green" | 28 |
|||
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Version du 27 juillet 2018 à 12:17
L'indice humidex est une mesure utilisée par les météorologues canadiens pour intégrer les effets combinés de la chaleur et de l'humidité. Il diffère de l'indice de chaleur utilisé aux États-Unis : celui-ci utilise l'humidité relative plutôt que le point de rosée.
La formule actuelle pour déterminer l'indice humidex a été développée au Canada en 1979 par J. M. Masterton et F. A. Richardson[1] au Service de l'environnement atmosphérique, qui est maintenant le Service météorologique du Canada.
Équation
La formule pour calculer l'humidex est la suivante[2] :
où
- Tair est la température de l'air (degré Celsius)
- e = 2,71828
- Trosee est le point de rosée (degré Celsius)
Température (°C) | ||||||||||||||||||
15 | 20 | 25 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 41 | 42 | 43 | |||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Point de rosée (°C) | ||||||||||||||||||
10 | 16 | 21 | 26 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 42 | 43 | 44 | ||
15 | 19 | 24 | 29 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 45 | 46 | 47 | ||
20 | 28 | 33 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 49 | 50 | 51 | |||
23 | 35 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 51 | 52 | 53 | ||||
24 | 36 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 52 | 53 | 54 | ||||
25 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | 53 | 54 | 55 | |||||
26 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | 52 | 54 | 55 | 56 | |||||
27 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 | 56 | 57 | 58 | |||||
28 | 46 | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 | 55 | 57 | 58 | 59 |
Ce qui donne, en utilisant l'humidité relative au lieu du point de rosée, et avec les mêmes températures et couleurs[3] :
Température (°C) | ||||||||||||||||||
21 | 25 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | |||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Humidité relative (%) | ||||||||||||||||||
20 | 40 | 41 | 43 | 44 | 46 | 47 | ||||||||||||
30 | 31 | 33 | 34 | 36 | 37 | 38 | 40 | 42 | 43 | 45 | 47 | 48 | 50 | 51 | ||||
40 | 26 | 34 | 35 | 37 | 39 | 40 | 42 | 44 | 45 | 47 | 49 | 51 | 53 | 54 | 56 | |||
50 | 22 | 28 | 36 | 38 | 40 | 41 | 43 | 45 | 47 | 49 | 51 | 53 | 55 | 57 | ||||
60 | 24 | 30 | 38 | 40 | 42 | 44 | 46 | 48 | 50 | 52 | 54 | 57 | ||||||
70 | 25 | 32 | 41 | 43 | 45 | 47 | 49 | 51 | 53 | 56 | 58 | |||||||
80 | 26 | 33 | 43 | 45 | 47 | 50 | 52 | 54 | 57 | 59 | ||||||||
90 | 28 | 35 | 45 | 48 | 50 | 52 | 55 | 57 | 60 | |||||||||
100 | 29 | 37 | 48 | 50 | 53 | 55 | 58 |
Interprétation
L'indice humidex est un nombre sans dimension, mais il utilise des valeurs qui ressemblent à une température en °C. C'est pourquoi il est souvent faussement considéré comme une température humide équivalente. D'après Environnement Canada, un indice humidex de[4] :
- moins de 30, aucun inconfort ;
- 30 à 39, un certain inconfort ;
- au-dessus de 40, beaucoup d'inconfort ;
- au-dessus de 45, il y a danger : un coup de chaleur est probable ;
- au-dessus de 54, un coup de chaleur est imminent.
Un avertissement de chaleur accablante sera émis quand l'humidex est prévu à 40 ou plus. Le record d'humidex au Canada est de 53,4 le 14 juillet 1961 à Castlegar battant le précédent record de 52,1 à Windsor (Ontario) en 1953. Cependant, personne ne le savait à l'époque car l'indice n'avait pas encore été inventé et ces valeurs sont tirées de calculs a posteriori.
Limitations
L'indice humidex ne tient compte que de la température de l'air et de l'humidité. Il ne tient pas compte de l'exposition de la peau au Soleil, qui va augmenter sa température par rapport à l'air, et des vents qui aident à l'évaporation de la sueur et donc au rafraîchissement de la peau. Un indice plus complet est celui de la température au thermomètre-globe mouillé.
Notes et références
- (en) Cet article est partiellement ou en totalité issu de l’article de Wikipédia en anglais intitulé « Humidex » (voir la liste des auteurs).
- (en) Masterson, J. et Richardson, F. A., Humidex, A Method of Quantifying Human Discomfort Due to Excessive Heat and Humidity, Downsview, Ontario, Environnement Canada, , 45 p.
- Service météorologique du Canada, « Comment calcule-t-on l'humidex? », Foire aux questions, Environnement Canada (consulté le )
- Centre canadien d'hygiène et de sécurité au travail - Gouvernement du Canada, « Indice humidex et le travail », (consulté le )
- « Risques de printemps et d'été (section Humidex) », sur Service météorologique du Canada, Environnement Canada (consulté le ).