I'm not really certain about eastern Canada, but in Calgary the seasons are something like: Spring: Mid-March til Mid-May. Snow goes away. Then it

I'm not really certain about eastern Canada, but in Calgary the seasons are something like: Spring: Mid-March til Mid-May. Snow goes away. Then it comes back. Then it goes away. Then it comes back. Then it goes away. Summer: Mid-May til early September (with luck) or late- August (without it). Mostly warm, usually dry. Punctuated by hailstorms. Once every few years punctuated with a smallish snow storm. Fall: Early September til late October. Stuff cools down. Frost is common. Occasional hail or freezing rain. Winter: Late October til mid-March. October-til-Christmas swings back and forth between (very) cold streaks and stereotypically fall-ish weather. January to March is mostly just cold and snowy and icy. Bear in mind that the climate really only gets worse the further east you go, culminating in the maritimes - where winters of five-foot snow alternate with summers of hurricanes. :P