Weather can make or break a road trip, so here's some data about year-round temperatures in Bayanaul to help you plan yours: The hottest months are usually July and June, with an average temperature of 18°C, while the coldest months are January and February, with an average of -11°C. The snowiest months in Bayanaul are February, March, January and April, with each month seeing an average of 98 cm of snowfall.