The climate of Eastern Ontario is humid continental with large seasonal variation. Snow and ice are dominant during the winter season. Summers are fairly warm and humid, usually lasting a little longer than winter does. The average July maximum temperature is 27C (80F). Temperatures rarely exceed 35C (95F), but during periods of hot weather, high humidity is often an aggravating factor.

Spring and fall are changabale seasons, prone to extremes in temperature and unpredictable swings in conditions. So when you visit here, make sure you bring clothes that can be worn in layers. Cornwall is generally a flat plain, dotted with some extensive woodlots and marshes, but is primarily farmland.

Cornwall Weather Forecast

5 Day Weather Forecast

Tuesday night Wednesday Wednesday night Clear Low 8°C Sunny with cloudy periods High 25°C A few showers High 25°C Thursday Friday Saturday A mix of sun and cloud High 18°C Sunny High 21°C Chance of showers High 22°C

Detailed Cornwall Weather Forecast

St-Anicet 6:00 PM EDT Tuesday 13 May 2008

Tuesday night Clear. Low 8. Wednesday Sunny. Becoming cloudy late in the day. Wind becoming southwest 20 km/h in the afternoon. High 25. UV index 7 or high. Wednesday night Cloudy. A few showers beginning in the evening. Wind southwest 20 km/h becoming light in the evening. Low 12. Thursday A mix of sun and cloud. High 18. Friday Sunny. Low plus 3. High 21. Saturday A mix of sun and cloud with 30 percent chance of showers. Low 6. High 22.