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Best Time for the New Zealand South Island
Sweet spot: March, December, April — computed from NASA POWER climate normals across the route's overnight towns, balancing temperature, rainfall and daylight.
Kiwi summer holidays — book Queenstown and Mt Cook far ahead.
Alpine winter: carry snow chains, check the Milford road status daily.
| Month | Temp | Rain | Daylight | |
|---|---|---|---|---|
| January | 1.2–27.7°C | 134 mm | 15.0 h | ❄ |
| February | 0.7–27.6°C | 108 mm | 13.8 h | ❄ |
| March | -0.6–24.1°C | 112 mm | 12.4 h | ❄ |
| April | -2.7–20.2°C | 116 mm | 10.8 h | ❄ |
| May | -4.5–17.5°C | 132 mm | 9.4 h | ❄ |
| June | -8.6–13.4°C | 122 mm | 8.7 h | ❄ |
| July | -8.3–11.6°C | 113 mm | 9.0 h | ❄ |
| August | -9.8–14.3°C | 109 mm | 10.2 h | ❄ |
| September | -4.8–15.7°C | 122 mm | 11.7 h | ❄ |
| October | -4.2–20.3°C | 134 mm | 13.3 h | ❄ |
| November | -3.2–23.2°C | 126 mm | 14.7 h | ❄ |
| December | -0.7–24.8°C | 140 mm | 15.3 h | ❄ |