| Month | Highest mean temperature (˚C) | Observed year | Coefficient of determination (%) |
| April | 2.7 | 2010 | 78.17 |
| May | 7 | 2007 | 83.84 |
| June | 13 | 2007 | 56.96 |
| July | 15.3 | 2007 | 72.99 |
| August | 13.7 | 2010 | 59.88 |
| September | 11.1 | 2009 | 84.65 |