Wind Chill Calculator
Determine how cold it really feels outdoors.
Enter Conditions (US/Imperial)
Temperature in Fahrenheit ($^{\circ}\text{F}$)
Speed in Miles Per Hour ($\text{MPH}$)
What is Wind Chill?
The **Wind Chill Temperature** is a measure of how cold it feels to human skin due to the combined effect of air temperature and wind speed. It is not the actual temperature of the air, but an indicator of the **rate of heat loss** from the body.
The Standard Formula (NWS/MSC)
This calculator uses the currently accepted standard formula developed by the U.S. National Weather Service (NWS) and Meteorological Service of Canada (MSC):
$$T_{wc} = 35.74 + 0.6215 T_{a} - 35.75 V^{0.16} + 0.4275 T_{a} V^{0.16}$$
This formula is physically most accurate when the **Air Temperature ($\mathbf{T_{a}}$) is $\mathbf{50^{\circ}F}$ or lower** and the **Wind Speed ($\mathbf{V}$) is $\mathbf{3\text{ MPH}}$ or higher**. Below $3\text{ MPH}$, wind has little additional cooling effect.