Taking into account the local weather in Leppäjärvi can help you maximize your time at the pool during your trip. The hottest months are usually July and August with an average temp of 50°F, while the coldest months are January and February with an average of 13°F. The snowiest months in Leppäjärvi are January, March, February, and December, with each month seeing an average of 119 inches of snowfall.