If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Newfoundland: The hottest months are usually July and August with an average temp of 66°F, while the coldest months are January and February with an average of 29°F. The snowiest months in Newfoundland are January, February, December, and March, with each month seeing an average of 12 inches of snowfall.