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Monthly climate in Altena, Germany

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Altena features a oceanic climate (Cfb). Temperatures typically range between 2 °C (35 °F) and 18 °C (64 °F) through the year, but rarely can drop to -17 °C (1 °F) or can rise to as high as 36 °C (97 °F). The average annual precipitation amounts to about 1096 mm (43.1 inches) and receives 175 rainy days on the 1 mm (0.04 inches) threshold annually. Altena enjoys an average of 3203 hours of sunshine throughout the year, and daylight varies from 7 hours 56 minutes to 16 hours 29 minutes per day.

Monthly average temperatures in Altena, Germany

The warmest months in Altena are June, July and August, with daily mean temperatures ranging from 17 to 18 °C (63 - 64 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 2 to 3 °C (35 - 38 °F) throughout the day. On average each year, Altena experiences 20 days above 25 °C (77.0 °F) and 52 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Altena. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum13°C
(55°F)		18°C
(65°F)		21°C
(70°F)		26°C
(79°F)		31°C
(87°F)		33°C
(91°F)		36°C
(97°F)		34°C
(93°F)		30°C
(86°F)		24°C
(76°F)		18°C
(65°F)		13°C
(56°F)
Mean maximum10°C
(50°F)		14°C
(57°F)		17°C
(63°F)		23°C
(73°F)		26°C
(79°F)		27°C
(82°F)		29°C
(85°F)		30°C
(85°F)		27°C
(81°F)		21°C
(69°F)		15°C
(60°F)		12°C
(53°F)
Average high3°C
(38°F)		6°C
(43°F)		9°C
(49°F)		13°C
(56°F)		17°C
(62°F)		22°C
(71°F)		22°C
(72°F)		22°C
(72°F)		18°C
(65°F)		14°C
(57°F)		8°C
(46°F)		5°C
(41°F)
Daily mean2°C
(35°F)		3°C
(37°F)		5°C
(42°F)		9°C
(48°F)		12°C
(54°F)		17°C
(63°F)		18°C
(64°F)		18°C
(64°F)		14°C
(57°F)		10°C
(51°F)		6°C
(42°F)		3°C
(38°F)
Average low-0°C
(32°F)		0°C
(33°F)		2°C
(35°F)		4°C
(40°F)		8°C
(46°F)		13°C
(55°F)		13°C
(56°F)		14°C
(57°F)		10°C
(50°F)		8°C
(46°F)		3°C
(39°F)		2°C
(35°F)
Mean minimum-6°C
(21°F)		-7°C
(20°F)		-5°C
(23°F)		-3°C
(27°F)		1°C
(34°F)		7°C
(44°F)		8°C
(47°F)		8°C
(46°F)		4°C
(40°F)		1°C
(35°F)		-2°C
(28°F)		-4°C
(25°F)
Minimum-13°C
(8°F)		-17°C
(1°F)		-12°C
(11°F)		-5°C
(23°F)		-1°C
(30°F)		6°C
(42°F)		7°C
(44°F)		7°C
(44°F)		0°C
(33°F)		-1°C
(31°F)		-5°C
(23°F)		-6°C
(22°F)

Compare climate in Altena with other places

Compare temperature, precipitation, sunshine, UV index in Altena, Germany with other places around the world.

Monthly average precipitation in Altena, Germany

Altena usually has the most precipitation in July, October and December, with an average of 16 rainy days and 112 mm (4.4 inches) of precipitation per month. The driest months in Altena are April, September and November. On average, 64 mm (2.5 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Altena. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)100 (3.9)96 (3.8)103 (4.1)49 (1.9)93 (3.7)81 (3.2)107 (4.2)96 (3.8)75 (3.0)104 (4.1)66 (2.6)124 (4.9)
Average precipitation days (≥ 1 mm)151416111513131613161320

Monthly sunshine hours in Altena, Germany

The sunniest months in Altena are May, June and July, when the sun shines an average of 12 hours 36 minutes a day. Least sunny months in Altena: January, November and December receive an average of 3 hours 58 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Altena. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours97191251337379379401373307217163104
Mean daily daylight hours8h 26m9h 59m11h 54m13h 53m15h 35m16h 29m16h 1m14h 28m12h 34m10h 37m8h 52m7h 56m

Solar UV radiation in Altena, Germany

Altena experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 7 - 8, which corresponds to the High / Very High category of sun exposure. January, February and December are in the Low exposure category. In these months, the maximum values of the UV index do not exceed 2. For more detailed information, check out our hourly Altena UV Index data.

Average daily maximum UV levels by month for Altena. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)124578875421