Christchurch has a temperate climate, although summers can be hotter than the norm for the South Island. They are usually pretty dry too, thanks to the shelter of the nearby mountains. Winter temperatures can be cold, with snow at sea level not unheard of. Christchurch has its own notorious wind - a fiery springtime nor'wester - that can cause widespread damage when at gale force.
| Month | Temp (°C) | Rainfall (mm) | Humidity (%) | Sunshine (hours) |
| Jan | 12 - 21 | 56 | 7 | |
| Feb | 12 - 21 | 43 | 7 | |
| Mar | 10 - 19 | 48 | 5 | |
| Apr | 7 - 17 | 48 | 5 | |
| May | 4 - 13 | 66 | 4 | |
| Jun | 2 - 11 | 66 | 4 | |
| Jul | 2 - 10 | 69 | 4 | |
| Aug | 2 - 11 | 48 | 5 | |
| Sep | 4 - 14 | 46 | 5 | |
| Oct | 7 - 17 | 43 | 6 | |
| Nov | 8 - 19 | 48 | 7 | |
| Dec | 11 - 21 | 56 | 7 |