| Months | Mean | SD | Min | Max |
| June | 240.1 | 33.8 | 100.7 | 498.7 |
| July | 223.4 | 45.3 | 122.7 | 830.3 |
| August | 167.8 | 56.9 | 108.8 | 263.7 |
| September | 168.7 | 39.4 | 121.5 | 308.8 |
| October | 190.6 | 30.7 | 96.7 | 330.2 |
| November | 171.7 | 37.7 | 102.9 | 218.6 |