If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Clarence-Rockland: The hottest months are usually July and August with an average temp of 65°F, while the coldest months are January and February with an average of 21°F. The snowiest months in Clarence-Rockland are January, December, April, and February, with each month seeing an average of 11 inches of snowfall.