If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Bonavista: The hottest months are usually July and August with an average temp of 58°F, while the coldest months are February and January with an average of 24°F. The snowiest months in Bonavista are February, March, January, and December, with each month seeing an average of 64 inches of snowfall.