Average annual temperature is 12.3 °C
Absolute maximum temperature: 33.8 °C
Absolute minimum temperature: -11.9 °C
Number of sunny days: 148 days
Number of rainy days: 209 days
Number of snow days: 8 days
Look at detailed online map of Ontario
* Weather data for Ontario United States is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 17.3 | 21.1 | 21.1 | 28.3 | 30.0 | 32.8 | 32.2 | 31.7 | 33.8 | 27.3 | 19.1 | 16.5 |
| Average daytime temperature (°C) | 8.1 | 11.2 | 10.8 | 18.8 | 22.0 | 25.8 | 28.5 | 27.0 | 24.5 | 18.2 | 11.5 | 9.1 |
| Average temperature (°C) | 3.6 | 4.6 | 4.8 | 11.8 | 15.4 | 19.5 | 22.8 | 21.5 | 18.7 | 13.2 | 6.0 | 4.8 |
| Average night temperature (°C) | 0.4 | -0.2 | 0.3 | 6.1 | 9.3 | 13.9 | 18.4 | 16.8 | 14.1 | 9.1 | 1.8 | 1.6 |
| Absolute minimum temperature (°C) | -6.5 | -11.9 | -8.3 | -1.8 | 2.1 | 8.9 | 14.7 | 11.6 | 8.9 | 1.0 | -7.1 | -5.2 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 15.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.7 | 10.7 | 12.0 | 13.3 | 14.4 | 15.0 | 14.7 | 13.7 | 12.5 | 11.1 | 10.0 | 9.4 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 2.8 | 6.9 | 6.5 | 8.5 | 10.2 | 10.8 | 10.8 | 10.3 | 8.6 | 6.5 | 6.7 | 4.2 |
| Precipitation (mm) | 111 | 63 | 98 | 51 | 104 | 133 | 116 | 108 | 48 | 115 | 41 | 57 |
| Sunny days | 9 | 14 | 12 | 14 | 19 | 11 | 2 | 8 | 12 | 15 | 20 | 12 |
| Rainy days | 19 | 13 | 17 | 16 | 12 | 19 | 29 | 23 | 18 | 16 | 9 | 18 |
| Snow days | 3 | 1 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 |
The best time to visit Ontario during the most sunny months:
The largest precipitation sum in Ontario is at