Average monthly and annual air temperature by climate zone (°F).
| Month | Climate zone | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2 | 4 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | |
| Jan | 45.1 | 48.7 | 56.8 | 54.7 | 55.4 | 53.4 | 44.6 | 45.0 | 47.0 | 43.0 | 55.6 |
| Feb | 50.0 | 51.9 | 56.4 | 56.1 | 56.8 | 55.6 | 49.7 | 50.3 | 52.1 | 48.3 | 59.3 |
| Mar | 52.8 | 54.5 | 57.4 | 57.6 | 57.7 | 56.2 | 52.9 | 53.4 | 55.5 | 52.4 | 64.8 |
| Apr | 55.5 | 57.1 | 59.3 | 60.6 | 60.7 | 59.9 | 58.0 | 57.5 | 62.0 | 56.9 | 71.3 |
| May | 60.5 | 61.3 | 62.2 | 63.6 | 64.2 | 64.5 | 66.9 | 64.3 | 69.7 | 66.0 | 78.7 |
| Jun | 65.7 | 65.6 | 65.4 | 67.4 | 68.2 | 70.1 | 73.3 | 69.5 | 77.6 | 74.8 | 87.9 |
| Jul | 68.1 | 67.2 | 69.1 | 70.9 | 73.3 | 76.3 | 77.7 | 72.7 | 82.1 | 82.3 | 92.2 |
| Aug | 67.4 | 68.3 | 70.0 | 70.7 | 72.7 | 76.3 | 75.6 | 71.5 | 80.2 | 81.5 | 91.5 |
| Sep | 64.8 | 66.8 | 68.9 | 70.1 | 71.6 | 72.9 | 70.8 | 68.3 | 73.8 | 73.1 | 85.7 |
| Oct | 60.0 | 61.7 | 65.8 | 65.3 | 66.8 | 66.2 | 62.5 | 61.9 | 65.2 | 63.2 | 75.3 |
| Nov | 50.7 | 53.3 | 59.9 | 59.3 | 58.8 | 57.9 | 52.0 | 52.6 | 53.3 | 49.9 | 61.9 |
| Dec | 46.4 | 49.6 | 56.4 | 55.7 | 55.4 | 52.6 | 45.1 | 45.7 | 46.6 | 43.3 | 55.4 |
| Year | 57.3 | 58.8 | 62.3 | 62.7 | 63.5 | 63.5 | 60.8 | 59.4 | 63.8 | 61.2 | 73.3 |