Two Young Girls Outside In The Winter

Humans evolved in tropical climate, and met cold weather as they migrated into Eurasia. Micro-evolution in Caucasian, Asiatic and Inuit people show some adaptation to the climate.
Winter and human health
Humans are sensitive to cold, hypothermia. Snowblindness, norovirus, seasonal depression and falling icicles are other health concerns associated with cold and snowy weather.