Similar to most of Eastern Ontario, Cornwall has a humid continental climate with cold, snowy winters and warm, humid summers. Precipitation occurs year round, with an average of 12 days per month having some form of precipitation (rain or snow). It is important to dress appropriately for the weather, especially having warm clothing and footwear during the winter.
Here are some statistical benchmarks for weather in the area:
Average Daily High Temperature
- June to August: 25 C
- September to November: 11 C
- December to Feburary: -3 C
- March to May: 11 C
Cornwall has some of the sunniest skies and cleanest air of communities in Canada.