Why does the wind choose to chill me?
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Wind Chill
Input Data
Wind Speed (MPH)
Air Temperature (ºF)
Information
A measure of the cooling effect of wind. Wind increases the rate at which a body loses heat, so the air on a windy day feels cooler than the temperature indicated by a thermometer. This heat loss can be calculated for various combinations of wind speed and air temperature and then converted to a wind chill equivalent temperature (or wind chill factor).
The formulae used to calculate the wind chill index are:
Old Wind Chill Index (Pre-November 2001)
91.4 - (0.474677 - 0.020425 *
V
+ 0.303107 * sqrt(
V
)) * (91.4 -
T
)
New Wind Chill Index
35.74 + 0.6215
T
- 35.75(
V
0.16
) + 0.4275
T
(
V
0.16
)
where: V = wind speed (mph) and T = temperature (°F)
Results
Wind Chill
Index (Old)
°F
Wind Chill
Index (New)
°F
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