If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Harbin: The hottest months are usually July and August with an average temp of 67°F, while the coldest months are January and December with an average of 8°F. The snowiest months in Harbin are January, November, December, and March, with each month seeing an average of 35 inches of snowfall.