In the South East England, where I lived, It could be -3 or so. Just a few days a year. Very pleasant climate. Normal winter temp and humidity like an autumn day in Skane ( Scania) I do not use wind chill factor. We 'white' people in my regiment were taught by the Saame most of the winterskills, everything from how to defecate to make drinking water. I know maybe 1% of what a reindeer farmer knows.