If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Tweed: The hottest months are usually July and August with an average temp of 67°F, while the coldest months are January and February with an average of 26°F. The snowiest months in Tweed are January, February, December, and March, with each month seeing an average of 8 inches of snowfall.