In reply to parkovski:
> Windchill works in part by increasing the rate of evaporation.
The wind will chill you more quickly if you are wet, of course - I hope that's kinda obvious to everyone - but that's not the "windchill factor" (i.e. when, like the OP, people state the windchill in a figure like -20). As far as I can see the UK/US method of calculating windchill doesn't take into wetness/evaporation. Wikipedia at least also says it is calculated on windspeed at face level (approx 1.5 mtrs), not foot height. If nothing else, if you're running in soft snow, your feet will be out of wind for all the time they are in the snow!
I don't think anyone doesn't agree that if you are wet and it is windy, you get cold much quicker than if you are not and there is no wind! I just think stated windchill factors seem to confuse far more than they inform, like in this original post where the chap mentions -20.
By the by; one thing if you are in snow and you do get wet feet, or wet anything else, is to remember snow is very absorbent of water. You'll still have wet feet, but if you can get out the ditch or where ever the water is (in my case going through lake ice a couple of times in shallows below!) packing snow round your feet, or rolling in it if your legs are wet too, will suck a lot of the water up and definitely helps you start to dry off, as long as you can stop going into more water - sometimes hard if hiking or running early winter or in not very cold places like the UK when ice is often only very thinly covering water.