If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Haines: The hottest months are usually August and July with an average temp of 49°F, while the coldest months are February and January with an average of 19°F. The snowiest months in Haines are December, January, November, and March, with each month seeing an average of 40 inches of snowfall.