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Monthly climate in Giessen, Germany

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Giessen features a oceanic climate (Cfb). Temperatures typically range between 2 °C (36 °F) and 20 °C (67 °F) through the year, but rarely can drop to -13 °C (9 °F) or can rise to as high as 38 °C (101 °F). The average annual precipitation amounts to about 723 mm (28.5 inches) and receives 134 rainy days on the 1 mm (0.04 inches) threshold annually. Giessen enjoys an average of 3329 hours of sunshine throughout the year, and daylight varies from 8 hours 4 minutes to 16 hours 21 minutes per day.

Monthly average temperatures in Giessen, Germany

The warmest months in Giessen are June, July and August, with daily mean temperatures ranging from 19 to 20 °C (66 - 67 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 2 to 4 °C (36 - 39 °F) throughout the day. On average each year, Giessen experiences 37 days above 25 °C (77.0 °F) and 50 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Giessen. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum12°C
(55°F)		19°C
(66°F)		21°C
(71°F)		26°C
(79°F)		31°C
(89°F)		34°C
(93°F)		38°C
(101°F)		35°C
(95°F)		33°C
(91°F)		26°C
(79°F)		20°C
(69°F)		14°C
(58°F)
Mean maximum11°C
(52°F)		14°C
(58°F)		18°C
(65°F)		23°C
(74°F)		27°C
(81°F)		29°C
(85°F)		32°C
(89°F)		32°C
(89°F)		29°C
(84°F)		22°C
(72°F)		17°C
(62°F)		13°C
(55°F)
Average high4°C
(40°F)		7°C
(44°F)		10°C
(51°F)		15°C
(58°F)		18°C
(65°F)		24°C
(75°F)		24°C
(76°F)		25°C
(76°F)		20°C
(69°F)		15°C
(58°F)		8°C
(47°F)		5°C
(42°F)
Daily mean2°C
(36°F)		3°C
(38°F)		6°C
(43°F)		10°C
(50°F)		13°C
(56°F)		19°C
(66°F)		19°C
(67°F)		20°C
(67°F)		15°C
(60°F)		11°C
(52°F)		6°C
(42°F)		4°C
(39°F)
Average low0°C
(33°F)		1°C
(33°F)		2°C
(36°F)		5°C
(41°F)		8°C
(48°F)		14°C
(57°F)		14°C
(58°F)		15°C
(59°F)		10°C
(51°F)		8°C
(46°F)		3°C
(38°F)		2°C
(35°F)
Mean minimum-5°C
(23°F)		-6°C
(22°F)		-5°C
(24°F)		-2°C
(29°F)		2°C
(36°F)		8°C
(46°F)		9°C
(49°F)		9°C
(49°F)		4°C
(40°F)		2°C
(36°F)		-2°C
(28°F)		-4°C
(25°F)
Minimum-10°C
(13°F)		-13°C
(9°F)		-11°C
(13°F)		-4°C
(26°F)		-0°C
(32°F)		6°C
(44°F)		8°C
(46°F)		7°C
(45°F)		3°C
(37°F)		0°C
(33°F)		-4°C
(26°F)		-7°C
(20°F)

Compare climate in Giessen with other places

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

Monthly average precipitation in Giessen, Germany

Giessen usually has the most precipitation in May, July and December, with an average of 12 rainy days and 78 mm (3.1 inches) of precipitation per month. The driest months in Giessen are April, September and November. On average, 42 mm (1.6 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Giessen. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)62 (2.4)54 (2.1)66 (2.6)36 (1.4)73 (2.9)64 (2.5)68 (2.7)64 (2.5)41 (1.6)54 (2.1)47 (1.9)95 (3.7)
Average precipitation days (≥ 1 mm)1211137111011137121116

Monthly sunshine hours in Giessen, Germany

The sunniest months in Giessen are May, June and July, when the sun shines an average of 12 hours 57 minutes a day. Least sunny months in Giessen: January, November and December receive an average of 4 hours 8 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Giessen. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours99201266342384393413384320241167113
Mean daily daylight hours8h 32m10h 3m11h 55m13h 49m15h 29m16h 21m15h 53m14h 24m12h 33m10h 40m8h 58m8h 4m

Solar UV radiation in Giessen, Germany

Giessen 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 Giessen UV Index data.

Average daily maximum UV levels by month for Giessen. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)224578875421