If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Koscielisko: The hottest months are usually August and July with an average temp of 58°F, while the coldest months are January and February with an average of 27°F. The snowiest months in Koscielisko are February, March, January, and December, with each month seeing an average of 111 inches of snowfall.