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Thursday, November 23, 2017

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Windchill Calculator and Conversion Charts

The windchill factor is a rate of cooling based on the combined effects of wind and low temperature. In other words it will indicate how fast a human body will cool under certain combinations of wind and temperature. Windchill will cause it to cool more quickly towards this temperature. The real hazard with windchill is that heat will be drawn away from your skin faster than the body can replace it. This may lead to frostbite or worse. 

The windchill calculator and charts below is based on the new North American standards that were released in the summer of 2001 and will be used North America wide.

Try this little JavaScript program I created for windchill.  If you don't have a Java-based browser, go to the chart for static measurements.

Temperature (Celsius)

Wind Speed (Kph)

Wind Chill  

This is a basic windchill chart that can be used for quick reference of temperatures you are experiencing.  The numbers are color coded to match what Windchill is a difficult thing to find and many formulas can be used.  If there is some differences between 2 charts, they will be very minor.

Air Temperature (癈)

0 -5 -10 -15 -20 -25 -30 -35 -40 -45
10 -3 -9 -15 -21 -27 -33 -39 -45 -51 -57
20 -5 -12 -18 -24 -31 -37 -43 -49 -56 -62
30 -7 -13 -20 -26 -33 -39 -46 -52 -59 -65
40 -7 -14 -21 -27 -34 -41 -48 -54 -61 -68
50 -8 -15 -22 -29 -35 -42 -49 -56 -63 -70
60 -9 -16 -23 -30 -37 -43 -50 -57 -64 -71

Color coding to match windchill factors issued by Environment Canada

Windchill (C) Qualifier Comfort and/or precautions description
0 to -10 Low Conditions are slightly uncomfortable for outdoor activity. Dress Warmly. Winter clothing is recommended, including hat, gloves and dry insulating under clothing.
-10 to -25 Moderate Cold on exposed skin. Conditions can be comfortable for outdoor activity on sunny days. Hat, gloves and layered dry insulating clothing is a necessity. Risk of hypothermia over prolonged periods.
-25 to -45 Cold Important to keep active. Cover all skin. Take frequent warm up breaks. Frostbite is possible on exposed skin over short periods of time so check frequently. Risk of hypothermia over prolonged periods.
-45 to -59
Warning Level*
Extreme Very uncomfortable. Outdoor activity should be limited to short periods. Cover all exposed skin. Dress in layers. Limit outdoor activities to short periods. Exposed skin freezes in minutes. Serious risk of hypothermia over prolonged periods.
-60 and colder Very Extreme Outdoor conditions are hazardous. Exposed skin will freeze in 2 minutes. Stay indoors.
* In Ontario/Atlantic provinces, the warning level is -35 C. In most areas of Canada, the warning level is -45 C. In northern Quebec, Manitoba, Labrador and the Arctic, the warning level is -50 C. In the high Arctic, the warning level is -55 C. This is due to human adaptability to cold over time.

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