Originally Posted by
Juha
Actually, national competition rules are based to the FIS international XC rules with a -20C limit (FIS: "the competition will be postponed or cancelled").
Competitions aside, it's nothing unusual to ski below -20C for fun.
--J
Thanks for fixing this. The limit was claimed by a Dutch living in Finland who might have not been resolving temperatures down from some threshold. On that note, a while ago I read a novel relaying experiences of prisoners in the Russian Siberia that gave methods of telling temperature without a thermometer such as 'If you spit and your spit freezes before arriving to the ground, the temperature is below something', etc.