| Month | Avg max | Avg min | Average | High | Date | Low | Date |
|---|---|---|---|---|---|---|---|
| Jan | 6.3 | 1.5 | 4.0 | 11.8 | 16 | -4.3 | 31 |
| Feb | 9.0 | 4.4 | 6.6 | 13.9 | 11 | -0.4 | 16 |
| Mar | 12.7 | 3.2 | 7.3 | 19.6 | 25 | -4.2 | 08 |
| Apr | 20.0 | 7.3 | 12.8 | 27.9 | 23 | 3.6 | 12 |
| May | 19.7 | 7.6 | 12.8 | 25.7 | 06 | 1.0 | 04 |
| Jun | 21.4 | 9.5 | 14.7 | 31.1 | 26 | 3.4 | 12 |
| Jul | 23.4 | 11.2 | 16.5 | 29.0 | 28 | 7.1 | 14 |
| Aug | 21.9 | 12.0 | 16.0 | 29.2 | 01 | 8.4 | 19 |
| Sep | 20.6 | 11.0 | 15.2 | 28.6 | 29 | 5.3 | 15 |
| Oct | 16.7 | 9.0 | 12.5 | 28.5 | 01 | 3.2 | 26 |
| Nov | 12.5 | 6.7 | 9.6 | 16.8 | 03 | 0.1 | 28 |
| Dec | 9.2 | 3.3 | 6.1 | 13.3 | 23 | -1.9 | 10 |
| 2011 | 16.2 | 7.3 | 11.3 | 31.1 | Jun | -4.3 | Jan |