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Monthly climate in Sumiainen, Finland

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Sumiainen features a subarctic climate (Dfc). Temperatures typically range between -6 °C (21 °F) and 17 °C (63 °F) through the year, but rarely can drop to -26 °C (-15 °F) or can rise to as high as 31 °C (88 °F). The average annual precipitation amounts to about 729 mm (28.7 inches) and receives 145 rainy days on the 1 mm (0.04 inches) threshold annually. Sumiainen enjoys an average of 3023 hours of sunshine throughout the year, and daylight varies from 5 hours 2 minutes to 19 hours 52 minutes per day.

Monthly average temperatures in Sumiainen, Finland

The warmest months in Sumiainen are June, July and August, with daily mean temperatures ranging from 15 to 17 °C (60 - 63 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -6 to -3 °C (21 - 26 °F) throughout the day. On average each year, Sumiainen experiences 9 days above 25 °C (77.0 °F) and 152 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Sumiainen. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum7°C
(45°F)		6°C
(43°F)		10°C
(51°F)		18°C
(66°F)		28°C
(83°F)		30°C
(86°F)		30°C
(87°F)		31°C
(88°F)		22°C
(72°F)		18°C
(65°F)		10°C
(51°F)		4°C
(40°F)
Mean maximum3°C
(38°F)		4°C
(39°F)		8°C
(46°F)		13°C
(55°F)		22°C
(72°F)		25°C
(77°F)		27°C
(82°F)		25°C
(77°F)		19°C
(66°F)		13°C
(56°F)		8°C
(46°F)		3°C
(37°F)
Average high-3°C
(26°F)		-4°C
(25°F)		1°C
(33°F)		5°C
(42°F)		12°C
(55°F)		19°C
(67°F)		21°C
(69°F)		19°C
(66°F)		13°C
(55°F)		7°C
(45°F)		2°C
(36°F)		-2°C
(29°F)
Daily mean-6°C
(22°F)		-6°C
(21°F)		-3°C
(27°F)		2°C
(35°F)		8°C
(48°F)		15°C
(60°F)		17°C
(63°F)		15°C
(60°F)		10°C
(50°F)		5°C
(41°F)		1°C
(34°F)		-3°C
(26°F)
Average low-8°C
(18°F)		-9°C
(16°F)		-6°C
(21°F)		-2°C
(28°F)		4°C
(39°F)		11°C
(52°F)		13°C
(55°F)		12°C
(53°F)		7°C
(46°F)		3°C
(38°F)		-1°C
(31°F)		-5°C
(23°F)
Mean minimum-21°C
(-6°F)		-20°C
(-3°F)		-18°C
(0°F)		-10°C
(15°F)		-2°C
(28°F)		6°C
(42°F)		8°C
(46°F)		7°C
(44°F)		1°C
(35°F)		-4°C
(26°F)		-9°C
(15°F)		-13°C
(10°F)
Minimum-26°C
(-15°F)		-26°C
(-14°F)		-25°C
(-12°F)		-13°C
(9°F)		-3°C
(26°F)		1°C
(34°F)		7°C
(44°F)		6°C
(43°F)		-2°C
(30°F)		-5°C
(24°F)		-13°C
(8°F)		-21°C
(-6°F)

Compare climate in Sumiainen with other places

Compare temperature, precipitation, sunshine, UV index in Sumiainen, Finland with other places around the world.

Monthly average precipitation in Sumiainen, Finland

Sumiainen usually has the most precipitation in August, September and October, with an average of 14 rainy days and 83 mm (3.3 inches) of precipitation per month. The driest months in Sumiainen are February, March and April. On average, 41 mm (1.6 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Sumiainen. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)45 (1.8)41 (1.6)38 (1.5)43 (1.7)60 (2.4)57 (2.3)71 (2.8)89 (3.5)80 (3.2)80 (3.1)62 (2.4)62 (2.4)
Average precipitation days (≥ 1 mm)12911101111111413161314

Monthly sunshine hours in Sumiainen, Finland

The sunniest months in Sumiainen are May, June and July, when the sun shines an average of 15 hours 2 minutes a day. Least sunny months in Sumiainen: January, November and December receive an average of 1 hours 21 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Sumiainen. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours371332533444154894783952421455828
Mean daily daylight hours6h 2m8h 47m11h 50m14h 56m17h 57m19h 52m18h 48m15h 56m12h 53m9h 49m6h 51m5h 2m

Solar UV radiation in Sumiainen, Finland

Sumiainen experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 5 - 6, which corresponds to the Moderate / High category of sun exposure. January, February and November are in the Low exposure category. In these months, the maximum values of the UV index do not exceed 1. For more detailed information, check out our hourly Sumiainen UV Index data.

Average daily maximum UV levels by month for Sumiainen. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)113456653211