Spring (September – November): Average -3.3°C to 1.0°C. Temperatures gradually rise but remain severely cold. September is the month with relatively more rainfall throughout the year (though total amount is still low). Weather changes rapidly, high-altitude areas still have snow cover, and the air is dry. Recommended activities: Alpine trekking (requires professional equipment and experience), glacier viewing, photography. Suggested attire: Multi-layered warm clothing, waterproof and windproof jacket, warm hat, gloves, scarf, sturdy waterproof hiking boots.
Summer (December – February): Average 3.9°C to 5.9°C. Temperatures are highest throughout the year but still low. Very little rainfall, mostly clear and dry weather. UV radiation is strong, with large day-night temperature differences. Recommended activities: Hiking (multiple trail options), glacier hiking, scenic flights, stargazing. Suggested attire: Warm base layers, waterproof and windproof jacket, trousers, sun protection (hat, sunglasses, sunscreen), hiking shoes.
Autumn (March – May): Average -2.5°C to 1.9°C. Temperatures drop rapidly, ushering in the eve of severe winter. Weather is dry, with potential for clear but cold days. Snowfall may begin in May. Recommended activities: Short hikes, admiring the first signs of snow on the mountains, photography. Suggested attire: Thick warm jacket, sweater, trousers, waterproof warm shoes, hat, gloves.
Winter (June – August): Average -3.7°C to -2.8°C. Extremely severe cold, temperatures often below freezing. Most precipitation is snow, creating a silvery-white world. Air is dry, and strong winds may occur. Recommended activities: Snow hiking (requires professional guidance), ice climbing (for experienced individuals only), glacier sightseeing. Suggested attire: Expedition-grade warm clothing (down jacket, wool layers), waterproof and windproof outer layer, snow pants, warm hat, thick gloves, snow boots, goggles.
Mt Cook climatological average
Annual average temperature: approx. 0.2°C / Annual rainfall: approx. 155 mm / Summer humidity: 40-60% / Rainiest month: September
Mt Cook monthly average temperature and precipitation
Month
Air temperature (°C)
Precipitation (mm)
January
5.9°C
19
February
4.7°C
6.9
March
1.9°C
7.7
April
1.6°C
18.7
May
-2.5°C
4.4
June
-2.8°C
8.9
July
-3.3°C
7.9
August
-3.7°C
17.6
September
-3.3°C
25.6
October
-1.3°C
14.5
November
1°C
11.1
December
3.9°C
12.9
Mt Cook weather for the next seven days
10/18
Saturday
Heavy rain
9.1°C/1.7°C
10/19
Sunday
Moderate rain
7.1°C/1.8°C
10/20
Monday
Heavy rain
8.7°C/1.7°C
10/21
Tuesday
Heavy rain
8.3°C/2.9°C
10/22
Wednesday
Moderate rain
9.1°C/-0.3°C
10/23
Thursday
Heavy rain
7.3°C/3.3°C
10/24
Friday
Patchy rain nearby
7.5°C/1.7°C
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