Avg 
|
Min
|
Max
|
Range
|
|
|---|---|---|---|---|
| January | 9.504 | -1.7 | 25.2 | 26.9 |
| February | 10.478 | -2.9 | 27.7 | 30.6 |
| March | 11.980 | 1.3 | 28.5 | 27.2 |
| April | 13.624 | 1.3 | 30.1 | 28.8 |
| May | 15.587 | 4.7 | 33.6 | 28.9 |
| June | 18.660 | 9.6 | 41.5 | 31.9 |
| July | 20.741 | 11.3 | 41.1 | 29.8 |
| August | 21.091 | 12.8 | 37.7 | 24.9 |
| September | 19.659 | 9.4 | 36.9 | 27.5 |
| October | 17.345 | 3.5 | 33.1 | 29.6 |
| November | 13.337 | 0.6 | 30.8 | 30.2 |
| December | 11.442 | -1.3 | 24.3 | 25.6 |