If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Edson: The hottest months are usually July and August, with an average temperature of 14°C, while the coldest months are February and December, with an average of -9°C. The snowiest months in Edson are February, March, January and April, with each month seeing an average of 57 cm of snowfall.