🍁 Toronto Weather

Great Lakes seasons, moderated by the water

Toronto has a humid continental climate with four clearly defined seasons, softened at the edges by Lake Ontario. The lake moderates the city's temperatures — trimming the worst of the winter cold near the shore and easing summer heat with lake breezes — while keeping humidity high through the warm months and feeding the occasional band of snow in winter.

Cold, snowy winters

Winters are cold and snowy, with January highs around 30°F (−1°C) and frequent dips well below freezing when Arctic air arrives. Snow accumulates through the season, and the city sees a mix of clipper systems and, at times, lake-effect snow. Biting wind off the lake can make the cold feel even sharper downtown.

Warm, humid summers

Summers are warm and humid, with July highs around 81°F (27°C) and heat waves that push the humidex much higher as moisture builds over the Great Lakes. Afternoon thunderstorms are common, and the lakefront stays noticeably cooler and more comfortable than inland neighborhoods on hot days.

Toronto averages about 33 inches (840 mm) of precipitation a year, fairly evenly spread, plus significant winter snow. Spring and autumn are pleasant, changeable transitions — autumn especially, with crisp air and brilliant foliage across the region.

Lake Ontario's moderating hand

Toronto's position on Lake Ontario softens its humid continental climate, easing winter's cold and delaying autumn frost near the shore. The lake also feeds cloud and the occasional lake-effect snow squall, while summer lake breezes cool the waterfront on hot afternoons.

Summers are warm and humid with thunderstorms, and heat waves push the humidex uncomfortably high, while winters are cold and snowy but milder than the Canadian interior thanks to the lake. Spring is slow to arrive as the cold water holds back the warmth, and the annual temperature swing remains wide.