Weather can make or break a roadtrip, so here's some data about year-round temperatures in Ereymentau to help you plan yours: The hottest months are usually July and August with an average temp of 64°F, while the coldest months are January and February with an average of 11°F. The snowiest months in Ereymentau are January, March, February, and December, with each month seeing an average of 47 inches of snowfall.