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Monthly climate in Cromwell, New Zealand

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Cromwell features a oceanic climate (Cfb). Temperatures typically range between 0 °C (33 °F) and 14 °C (57 °F) through the year, but rarely can drop to -13 °C (9 °F) or can rise to as high as 28 °C (83 °F). The average annual precipitation amounts to about 1046 mm (41.2 inches) and receives 139 rainy days on the 1 mm (0.04 inches) threshold annually. Cromwell enjoys an average of 2849 hours of sunshine throughout the year, and daylight varies from 8 hours 48 minutes to 15 hours 31 minutes per day.

Monthly average temperatures in Cromwell, New Zealand

The warmest months in Cromwell are January, February and December, with daily mean temperatures ranging from 12 to 14 °C (55 - 57 °F) throughout the day. The coldest temperatures usually occur in June, July and August, when daily mean temperatures range from 0 to 2 °C (33 - 37 °F) throughout the day. On average each year, Cromwell experiences 2 days above 25 °C (77.0 °F) and 88 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Cromwell. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum28°C
(83°F)		25°C
(78°F)		23°C
(74°F)		21°C
(69°F)		16°C
(61°F)		14°C
(57°F)		9°C
(48°F)		13°C
(56°F)		16°C
(60°F)		21°C
(71°F)		25°C
(77°F)		24°C
(76°F)
Mean maximum25°C
(78°F)		24°C
(75°F)		22°C
(71°F)		18°C
(65°F)		14°C
(58°F)		10°C
(51°F)		8°C
(46°F)		11°C
(52°F)		15°C
(58°F)		19°C
(66°F)		22°C
(72°F)		23°C
(73°F)
Average high19°C
(66°F)		18°C
(65°F)		17°C
(63°F)		13°C
(55°F)		9°C
(48°F)		5°C
(41°F)		4°C
(39°F)		6°C
(43°F)		9°C
(48°F)		12°C
(54°F)		15°C
(60°F)		17°C
(63°F)
Daily mean14°C
(57°F)		13°C
(56°F)		12°C
(54°F)		8°C
(46°F)		5°C
(40°F)		1°C
(35°F)		0°C
(33°F)		2°C
(37°F)		4°C
(40°F)		8°C
(46°F)		10°C
(51°F)		12°C
(55°F)
Average low9°C
(48°F)		8°C
(47°F)		7°C
(45°F)		4°C
(39°F)		1°C
(34°F)		-2°C
(29°F)		-3°C
(27°F)		-1°C
(31°F)		-0°C
(32°F)		3°C
(37°F)		5°C
(42°F)		8°C
(46°F)
Mean minimum3°C
(38°F)		3°C
(37°F)		1°C
(35°F)		-2°C
(29°F)		-6°C
(22°F)		-6°C
(22°F)		-9°C
(15°F)		-9°C
(16°F)		-6°C
(21°F)		-5°C
(24°F)		-1°C
(30°F)		3°C
(38°F)
Minimum2°C
(37°F)		1°C
(35°F)		-1°C
(30°F)		-4°C
(25°F)		-10°C
(14°F)		-11°C
(13°F)		-13°C
(9°F)		-13°C
(9°F)		-8°C
(17°F)		-8°C
(19°F)		-3°C
(26°F)		1°C
(34°F)

Compare climate in Cromwell with other places

Compare temperature, precipitation, sunshine, UV index in Cromwell, New Zealand with other places around the world.

Monthly average precipitation in Cromwell, New Zealand

Cromwell usually has the most precipitation in February, November and December, with an average of 12 rainy days and 110 mm (4.3 inches) of precipitation per month. The driest months in Cromwell are April, June and August. On average, 62 mm (2.5 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Cromwell. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)86 (3.4)105 (4.1)78 (3.1)77 (3.0)79 (3.1)53 (2.1)97 (3.8)57 (2.3)101 (4.0)87 (3.4)112 (4.4)114 (4.5)
Average precipitation days (≥ 1 mm)11109101110131213131314

Monthly sunshine hours in Cromwell, New Zealand

The sunniest months in Cromwell are February, November and December, when the sun shines an average of 10 hours 6 minutes a day. Least sunny months in Cromwell: May, June and July receive an average of 5 hours 24 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Cromwell. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours261284262217184158155192242263301324
Mean daily daylight hours15h 9m13h 54m12h 21m10h 47m9h 28m8h 48m9h 8m10h 17m11h 46m13h 21m14h 46m15h 31m

Solar UV radiation in Cromwell, New Zealand

Cromwell experiences the highest level of ultraviolet (UV) radiation in January, February and December, when the maximum UV index can reach values of 12 - 13, which corresponds to the Extreme category of sun exposure. May, June and July are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 3. For more detailed information, check out our hourly Cromwell UV Index data.

Average daily maximum UV levels by month for Cromwell. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)1312963224591013