Weather can make or break a roadtrip, so here's some data about year-round temperatures in Mosquito Lake to help you plan yours: The hottest months are usually August and July with an average temp of 49°F, while the coldest months are February and December with an average of 19°F. The snowiest months in Mosquito Lake are December, January, November, and March, with each month seeing an average of 40 inches of snowfall.