| City | Average (°C) | Record (°C) | Yearly (cm) | |||
|---|---|---|---|---|---|---|
| High | Low | High | Low | Precipitation | Snow | |
| Barrie | 12.0 | 2.4 | 38.9 | -38.9 | 97.7 | 278.3 |
| Belleville | 13.0 | 3.7 | 40.0 | -39.4 | 86.7 | 106.6 |
| Brockville | 12.3 | 3.4 | 39.4 | -38.3 | 100.9 | 177.0 |
| Cornwall | 12.6 | 3.4 | 37.8 | -43.3 | 98.5 | 195.1 |
| Hamilton | 13.8 | 3.9 | 41.1 | -30.6 | 79.3 | n/a |
| Kapuskasing | 7.7 | -4.3 | 38.3 | -47.2 | 83.2 | 304.7 |
| Kingston | 12.3 | 3.2 | 35.6 | -35.6 | 89.4 | n/a |
| Kitchener | 12.6 | 1.9 | 38.3 | -34.1 | 80.7 | n/a |
| London | 13.1 | 3.4 | 41.1 | -32.8 | 94.7 | n/a |
| Moosonee | 6.2 | -5.2 | 37.8 | -46.7 | 71.5 | 221.3 |
| North Bay | 9.4 | -0.2 | 37.2 | -44.4 | 105.3 | 315.1 |
| Orillia | 11.8 | 2.4 | 40.0 | -37.0 | 105.8 | 309.5 |
| Oshawa | 12.5 | 3.8 | 37.8 | -32.8 | 81.3 | 99.2 |
| Ottawa | 11.8 | 2.2 | 37.8 | -38.9 | 92.7 | 181.7 |
| Peterborough | 12.6 | 0.6 | 38.9 | -39.4 | 80.7 | n/a |
| Sarnia | 13.3 | 4.0 | 39.1 | -28.9 | 84.9 | 112.6 |
| Sioux Lookout | 7.6 | -2.7 | 39.4 | -46.1 | 80.8 | 214.1 |
| St. Catharines | 13.2 | 6.3 | 40.0 | -24.4 | 69.6 | n/a |
| St. Thomas | 13.9 | 4.0 | 38.9 | -34.4 | 91.3 | 111.6 |
| Sudbury | 9.4 | -0.8 | 38.3 | -42.8 | 91.4 | 273.8 |
| Thunder Bay | 9.4 | -3.1 | 40.3 | -43.2 | 61.0 | n/a |
| Timmins | 8.1 | -4.0 | 39.4 | -45.6 | 80.8 | 308.9 |
| Toronto | 13.5 | 6.0 | 40.6 | -32.8 | 81.0 | n/a |
| Welland | 14.0 | 4.3 | 37.8 | -32.8 | 90.9 | 131.2 |
| Windsor | 15.4 | 6.2 | 40.2 | -28.0 | 94.3 | 105.7 |
| Woodstock | 13.3 | 3.2 | 38.9 | -36.7 | 93.6 | 105.5 |