For example, if you know that your motorcycle clothing will keep you warm down to about 20oF and the temperature for the day is forecast to be 35o for a trip down the interstate. Will this clothing be sufficient to keep you warm? At 35oF and at 70 mph the wind chill, how the air will feel to your skin, will be about 16.5o so you might get cold! However, if it warms up to 40o you should be fine.
Calculations in this program are based on a forumla obtained from the National Weather Service at This Web Site The formula is:
Windchill (oF) = 35.74 + 0.6215T - 35.75(V^0.16) + 0.4275T(V^0.16)
According to the NWS web site, "Windchill Temperature is only defined for temperatures at or below 50 degrees F and wind speeds above 3 mph."  I take this to mean that the formula will provide invalid numbers above 50°F. I've also been told that at temperatures around 84° the numbers start going backwards ;)