Snow accumulation reaches the seasonal maximum in February over Canada. The area around the Great Lakes can suffer from extreme blizzards, but the north-west coast is noted for mild, wet winters. East of the Rockies, the 'Chinook' wind can raise temperatures by up to 22 °C (40 °F) in an hour or so. Average daytime temperatures vary from 7 °C (45 °F) at Vancouver, to -1 °C (30 °F) at Toronto. The west coast is wet, with about 10 dry days each month on average, but Toronto averages 16-17 such days. Average sunshine hours are about 1-2 hours.
The transition from winter to summer occurs very quickly from mid-April, the daily average temperature at Toronto rising from 4 °C (39 °F) to 18 °C (66 °F). The average number of dry days ranges from 14 in the west in March, to 19 at Toronto in May. The average number of sunshine-hours per day is about 6.
In Canada, the summer is warm (25 °C - 77 °F) and sunny with only moderate rainfall (about 50-100 mm per month). Sea fog is sometimes rather persistent on the east coast. Average daily hours of sunshine number 7-9, whilst about 21-24 days are dry.
There is a marked tail-off in daily maximum temperatures during the autumn months, varying (at Toronto) from 22 °C (70 °F) in September, to 7 °C (45 °F) in November. Dry days vary from 16-21, although Vancouver has a wetter November (12 days), whilst average daily sunshine hours are about 3.