Pacific West Coast has cool summers between 20 and 30 degrees. Mild winters with little snow and rarely below -5 degrees. It rains a lot though in the winter and spring. Almost every day. Bring a raincoat.
Rockies Mountains have cool summers due to the elevation with highs of 25 and lows of 6 degrees. Cold winters between -30 and -5 degrees. For campers, this means bringing along a fleece insert for your sleeping bag or a proper winter sleeping bag… Even in the summer. Winter camping is not recommended and at your own risk.
Central Plains weather is wild. The summers reach up to +40 degrees with long days and sunshine in the dry semi-arid heat. However the winters are a nightmare, dropping to -40 or even -60 with freezing wind so dry it’ll feel like your face is burning. The locals use face masks on the cold days.
Ontario & Quebec has warm summers reaching 30 to 40 degrees regularly. However the further east you go in the winter, the worse the snow. The winters there can drop to -30 degrees with snow falling to the waist.
Atlantic Provinces summers are probably the best in Canada. Temperatures range between 20 and 30 degrees with little rain and a cool ocean breeze. However the winters bring snow hurricanes, icy a foot thick on the roads and temperatures as low as -20 degrees. The east coast is more humid, so the cold feels worse than the dryer regions. We say “It gets into your bones”.
The Arctic Territories are popular in the winter for the Aurora Borealis (Northern Lights) but they are also amazing to visit in the summer when it’s sunny up to 23 hours a day and 22 degrees! The winter is a bone chilling -50 to -20 degrees. Good Luck!