Wind-Chill Equivalent Temperatures

The true effect of winter weather on your body can be deceiving. While the air temperature may not seem too cold, the wind may increase its effect. To find the wind chill, find the actual air temperature in the "Calm Air" column, then look for the corresponding value under the column closest to the current air speed. For example, if the actual air temperature is 20 degrees Fahrenheit, a wind speed of 40 mph makes the air feel like -1 degree.