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Monthly climate in Sleen, Netherlands

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Sleen features a oceanic climate (Cfb). Temperatures typically range between 4 °C (39 °F) and 18 °C (65 °F) through the year, but rarely can drop to -14 °C (6 °F) or can rise to as high as 37 °C (100 °F). The average annual precipitation amounts to about 830 mm (32.7 inches) and receives 155 rainy days on the 1 mm (0.04 inches) threshold annually. Sleen enjoys an average of 3340 hours of sunshine throughout the year, and daylight varies from 7 hours 42 minutes to 16 hours 45 minutes per day.

Monthly average temperatures in Sleen, Netherlands

The warmest months in Sleen are June, July and August, with daily mean temperatures ranging from 18 to 18 °C (64 - 65 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 4 to 5 °C (39 - 41 °F) throughout the day. On average each year, Sleen experiences 21 days above 25 °C (77.0 °F) and 34 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Sleen. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum14°C
(58°F)		18°C
(65°F)		21°C
(70°F)		28°C
(83°F)		31°C
(88°F)		36°C
(96°F)		37°C
(100°F)		35°C
(95°F)		30°C
(87°F)		27°C
(81°F)		19°C
(66°F)		14°C
(57°F)
Mean maximum12°C
(53°F)		14°C
(58°F)		18°C
(65°F)		24°C
(75°F)		27°C
(80°F)		29°C
(84°F)		30°C
(87°F)		31°C
(88°F)		27°C
(81°F)		21°C
(71°F)		15°C
(60°F)		13°C
(55°F)
Average high6°C
(43°F)		7°C
(45°F)		10°C
(50°F)		14°C
(57°F)		18°C
(64°F)		22°C
(72°F)		22°C
(73°F)		23°C
(73°F)		19°C
(66°F)		15°C
(59°F)		9°C
(49°F)		7°C
(44°F)
Daily mean4°C
(39°F)		4°C
(40°F)		6°C
(43°F)		9°C
(49°F)		13°C
(56°F)		18°C
(64°F)		18°C
(65°F)		18°C
(65°F)		15°C
(59°F)		12°C
(53°F)		7°C
(45°F)		5°C
(41°F)
Average low2°C
(35°F)		2°C
(35°F)		2°C
(37°F)		4°C
(40°F)		8°C
(47°F)		13°C
(55°F)		13°C
(56°F)		14°C
(57°F)		10°C
(51°F)		9°C
(48°F)		5°C
(40°F)		3°C
(37°F)
Mean minimum-4°C
(25°F)		-5°C
(23°F)		-3°C
(27°F)		-3°C
(28°F)		1°C
(33°F)		8°C
(46°F)		8°C
(47°F)		9°C
(48°F)		5°C
(41°F)		2°C
(36°F)		-1°C
(30°F)		-3°C
(26°F)
Minimum-8°C
(17°F)		-14°C
(6°F)		-9°C
(15°F)		-4°C
(25°F)		-1°C
(30°F)		6°C
(43°F)		7°C
(45°F)		8°C
(46°F)		4°C
(39°F)		-1°C
(31°F)		-2°C
(29°F)		-7°C
(20°F)

Compare climate in Sleen with other places

Compare temperature, precipitation, sunshine, UV index in Sleen, Netherlands with other places around the world.

Monthly average precipitation in Sleen, Netherlands

Sleen usually has the most precipitation in July, August and December, with an average of 15 rainy days and 83 mm (3.3 inches) of precipitation per month. The driest months in Sleen are April, May and November. On average, 51 mm (2.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Sleen. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)63 (2.5)69 (2.7)73 (2.9)40 (1.6)61 (2.4)80 (3.2)83 (3.3)82 (3.2)65 (2.5)81 (3.2)50 (2.0)83 (3.2)
Average precipitation days (≥ 1 mm)12121591412141510141216

Monthly sunshine hours in Sleen, Netherlands

The sunniest months in Sleen are May, June and July, when the sun shines an average of 12 hours 51 minutes a day. Least sunny months in Sleen: January, November and December receive an average of 4 hours 27 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Sleen. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours97194267345397386399385313240187125
Mean daily daylight hours8h 14m9h 53m11h 54m13h 58m15h 48m16h 45m16h 14m14h 36m12h 36m10h 33m8h 41m7h 42m

Solar UV radiation in Sleen, Netherlands

Sleen experiences the highest level of ultraviolet (UV) radiation in May, June 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 Sleen UV Index data.

Average daily maximum UV levels by month for Sleen. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)124578775321