Although Eastern Ontario is situated in Canada, which has a reputation for being very cold, Eastern Ontario is part of the Great Lakes-St. Lawrence Lowlands region, which arguably has the warmest and driest weather in Canada. Summers in Eastern Ontario usually last about 5-6 months long, and winters are about 4-4 1/2 months long. Autumn and spring are very short (especially Autumn).
The first snowfalls of the year usually occur in mid-to-late November, but snow doesn't actually cover the ground until December. Before that, snow usually melts as soon as it hits the ground.
In the spring, the snow usually starts melting in March, although occasional "warm breaks" with temperatures as high as 10°C (50°F) usually occur once or twice in January and February.
In recent years, winters have gotten much warmer, so often in the winter freezing rain will occur, when it is not warm enough for rain but not cold enough for snow. Freezing rain is basically raining ice pellets, which makes driving very hazardous and often closes down schools and makes the roads very icy for a few days.
In the summer, humidity is often common, especially in July. Although temperatures are usually just under 30°C (86°F), with the humidity it can feel as hot as 35°C or higher.
Average Afternoon Temperatures Per Month:
(Statistics based on temperatures in Eastern Ontario over the course of 2000-2005)