Weather can make or break a road trip, so here's some data about year-round temperatures in Norris to help you plan yours: The hottest months are usually July and August, with an average temperature of 23°C, while the coldest months are January and February, with an average of -2°C. The snowiest months in Norris are April, February, March and December, with each month seeing an average of 17 cm of snowfall.