Snow and winter storms in Canada

By Julia · weather-canada.com editorial team · Published 16 October 2026

Lake-effect snow, the local speciality

East and south-east of the Great Lakes lie the snowbelts, where annual totals are two or three times those of cities only a hundred kilometres away. The mechanism is simple: cold air crosses open, relatively warm water, picks up moisture, and dumps it as soon as it meets land and rising ground.

That is why Barrie, Owen Sound and the ground above London, Ontario receive extraordinary amounts while Toronto, on the lee of nothing, gets far less. A single band can drop fifty centimetres on one town and leave the next one, twenty kilometres away, in sunshine.

Lake-effect snow ends when the lakes freeze, which is why late December and January are the worst weeks and March is comparatively quiet. A mild winter with open water prolongs the season instead of shortening it.

Nor’easters on the Atlantic coast

The Atlantic provinces live with a different system: deep lows that track up the eastern seaboard and deepen over the Gulf Stream, bringing wind, heavy snow and, increasingly often, rain. Halifax, Saint John and St. John’s can get all three in one storm.

The defining feature is the rain-snow line, which often runs straight through the region. Thirty kilometres can be the difference between sixty centimetres of snow and a flooded street, and the line moves during the storm as the low passes.

Wind is what makes these storms dangerous rather than snow totals: gusts above 100 km/h bring down power lines, and blowing snow reduces visibility to nothing on open coastal roads.

Prairie blizzards and mountain snow

On the Prairies the problem is rarely the amount of snow but the wind that moves it. A blizzard there can follow a modest snowfall: twenty centimetres already on the ground, a 70 km/h wind, and highways close because nobody can see.

In the Rockies and the Coast Mountains the pattern reverses. Pacific storms unload metres of snow on the windward slopes — Whistler, Revelstoke, Rogers Pass — while the valleys east of the divide stay dry and cold. Avalanche bulletins matter more there than snowfall forecasts.

The practical rule for both is to read the wind alongside the snow. Our town pages show gusts next to the daily totals, and the combination explains closures that a snowfall figure alone never would.

Vancouver: the winter that rains

The west coast has the mildest winter in the country and the wettest. Vancouver and Victoria sit under a procession of Pacific fronts, and at sea level most of that falls as rain — several hundred millimetres between November and February.

Snow in Vancouver is an event of a few days, usually when Arctic air spills through the Fraser Canyon and meets a front. Those are the days the city stops, because twenty centimetres on hills designed for rain is harder than a metre on the Prairies.

Altitude is everything here: the North Shore mountains, twenty minutes from downtown, hold a deep snowpack while the city is green. Comparing two of our pages — the city and the resort above it — shows the gap better than any monthly average.