If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Celoron: The hottest months are usually July and August, with an average temperature of 18°C, while the coldest months are January and February, with an average of -2°C. The snowiest months in Celoron are January, November, March and December, with each month seeing an average of 21 cm of snowfall.