Template:Heat index
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Heat index for 93 °F, RH 57% = 105.6
Template documentationHeat index - Calculated by temperature & relative humidity
Purpose
The Template:Heat_index calculates the heat index, for a specified temperature and relative humidity (parameters 1 & 2), using a formula from the U.S. National Weather Service (NWS).[1]
Science
Formula from U.S. National Weather Service (NWS):
HI = 16.923 + 1.85212·10-1·T + 5.37941·RH - 1.00254·10-1·T·RH + 9.41695·10-3·T^2 + 7.28898·10-3·RH^2 + 3.45372·10-4·T^2·RH - 8.14971·10-4·T·RH^2 + 1.02102·10-5·T^2·RH^2 - 3.8646·10-5·T^3 + 2.91583·10-5·RH^3 + 1.42721·10-6·T^3·RH + 1.97483·10-7·T·RH^3 - 2.18429·10-8·T^3·RH^2 + 8.43296·10-10·T^2·RH^3 - 4.81975·10-11·T^3·RH^3
where "HI" is 'heat index', "RH" is 'relative humidity', "T" is 'temperature'
Syntax
{{heat index|parameter1|parameter2|r=round|disp=out}}
Parameters
The mandatory parameters are:
- 1 — the air temperature in degrees Fahrenheit
- 2 — the relative humidity as a percentage
The optional parameters are:
- r=2 (round=2) — to show 2 decimal places
- disp=out — to show only the output number
Examples
The following are some typical examples:
{{heat index|65|90}}→ Heat index for 65 °F, RH 90% = 76.7{{heat index|75|90}}→ Heat index for 75 °F, RH 90% = 79.1{{heat index|75|35}}→ Heat index for 75 °F, RH 35% = 76{{heat index|85|65}}→ Heat index for 85 °F, RH 65% = 91.2{{heat index|85|30}}→ Heat index for 85 °F, RH 30% = 83{{heat index|90|57}}→ Heat index for 90 °F, RH 57% = 98.6{{heat index|95|57|r=2}}→ Heat index for 95 °F, RH 57% = 110.85{{heat index|95|10|disp=out}}→ 88.7
References
- ^ Convertalot.com, "Heat Index Calculator" (CAinx) — Computes the heat index, 2009