Weather can make or break a road trip, so here's some data about year-round temperatures in Jetmore to help you plan yours: The hottest months are usually July and August, with an average temperature of 26°C, while the coldest months are January and February, with an average of 3°C. The snowiest months in Jetmore are January, November, February and March, with each month seeing an average of 14 cm of snowfall.