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How do you calculate the wind chill factor?

Question submitted by Jackie Ward
(Surrey, BC)

Environment Canada has a web site dedicated to the subject of wind chill:
http://www.msc.ec.gc.ca/education/windchill/index_e.cfm

But basically the calculation is as follows:
Tair = air temperature, V = wind (km/h):
WC = 13.12 + 0.6215 × Tair - 11.37 × V (exp 0.16) + 0.3965 × Tair × V ( exp 0.16)

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