If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Gypsum: The hottest months are usually July and August with an average temp of 62°F, while the coldest months are January and December with an average of 21°F. The snowiest months in Gypsum are March, January, February, and April, with each month seeing an average of 8 inches of snowfall.