| Month | Daily minimum (°C) | Daily maximum (°C) | Days of rain | Rainfall (mm) |
|---|---|---|---|---|
| January | 10.9 | 26.1 | 9.3 | 34.7 |
| February | 11.1 | 26.6 | 7.2 | 24.4 |
| March | 10.1 | 24.0 | 9.2 | 33.5 |
| April | 8.2 | 19.8 | 12.1 | 38.0 |
| May | 6.4 | 15.7 | 16.9 | 49.4 |
| June | 5.0 | 13.0 | 20.0 | 68.0 |
| July | 4.3 | 12.1 | 20.3 | 64.4 |
| August | 4.8 | 13.3 | 20.6 | 78.9 |
| September | 5.8 | 15.1 | 18.1 | 72.3 |
| October | 6.5 | 17.5 | 17.0 | 60.1 |
| November | 7.8 | 20.5 | 13.0 | 48.5 |
| December | 9.4 | 23.8 | 10.8 | 41.2 |
| Statistics provided by BOM for Hamilton Airport (nearest comparable weather site to Hamilton) | ||||