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Monthly climate in Ilomantsi, Finland

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Ilomantsi features a subarctic climate (Dfc). Temperatures typically range between -8 °C (18 °F) and 17 °C (62 °F) through the year, but rarely can drop to -31 °C (-24 °F) or can rise to as high as 32 °C (90 °F). The average annual precipitation amounts to about 814 mm (32.1 inches) and receives 160 rainy days on the 1 mm (0.04 inches) threshold annually. Ilomantsi enjoys an average of 2954 hours of sunshine throughout the year, and daylight varies from 5 hours 1 minutes to 19 hours 52 minutes per day.

Monthly average temperatures in Ilomantsi, Finland

The warmest months in Ilomantsi are June, July and August, with daily mean temperatures ranging from 15 to 17 °C (59 - 62 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -8 to -5 °C (18 - 24 °F) throughout the day. On average each year, Ilomantsi experiences 12 days above 25 °C (77.0 °F) and 170 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Ilomantsi. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum5°C
(42°F)		5°C
(41°F)		12°C
(53°F)		18°C
(64°F)		31°C
(88°F)		32°C
(90°F)		31°C
(89°F)		29°C
(85°F)		23°C
(74°F)		18°C
(65°F)		9°C
(49°F)		3°C
(38°F)
Mean maximum2°C
(36°F)		2°C
(37°F)		8°C
(46°F)		14°C
(57°F)		24°C
(75°F)		27°C
(81°F)		28°C
(83°F)		25°C
(77°F)		19°C
(67°F)		13°C
(56°F)		7°C
(46°F)		2°C
(36°F)
Average high-5°C
(23°F)		-5°C
(23°F)		0°C
(32°F)		6°C
(43°F)		13°C
(56°F)		20°C
(68°F)		21°C
(70°F)		19°C
(66°F)		13°C
(55°F)		6°C
(43°F)		1°C
(34°F)		-3°C
(27°F)
Daily mean-8°C
(19°F)		-8°C
(18°F)		-4°C
(25°F)		1°C
(35°F)		9°C
(48°F)		15°C
(60°F)		17°C
(62°F)		15°C
(59°F)		9°C
(49°F)		4°C
(40°F)		-0°C
(31°F)		-5°C
(24°F)
Average low-10°C
(14°F)		-11°C
(12°F)		-8°C
(18°F)		-3°C
(27°F)		3°C
(38°F)		10°C
(49°F)		12°C
(53°F)		11°C
(51°F)		6°C
(43°F)		2°C
(36°F)		-2°C
(28°F)		-7°C
(20°F)
Mean minimum-26°C
(-15°F)		-24°C
(-12°F)		-21°C
(-5°F)		-11°C
(13°F)		-4°C
(26°F)		4°C
(39°F)		6°C
(43°F)		5°C
(41°F)		-1°C
(31°F)		-6°C
(21°F)		-13°C
(9°F)		-17°C
(1°F)
Minimum-31°C
(-24°F)		-31°C
(-24°F)		-29°C
(-20°F)		-16°C
(4°F)		-6°C
(22°F)		1°C
(34°F)		5°C
(41°F)		4°C
(39°F)		-3°C
(27°F)		-12°C
(11°F)		-18°C
(0°F)		-26°C
(-15°F)

Compare climate in Ilomantsi with other places

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

Monthly average precipitation in Ilomantsi, Finland

Ilomantsi usually has the most precipitation in July, August and October, with an average of 15 rainy days and 95 mm (3.7 inches) of precipitation per month. The driest months in Ilomantsi are January, February and April. On average, 48 mm (1.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Ilomantsi. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)49 (1.9)50 (2.0)54 (2.1)46 (1.8)60 (2.4)60 (2.3)95 (3.7)105 (4.1)78 (3.1)85 (3.4)61 (2.4)71 (2.8)
Average precipitation days (≥ 1 mm)131213101211131614161416

Monthly sunshine hours in Ilomantsi, Finland

The sunniest months in Ilomantsi are May, June and July, when the sun shines an average of 15 hours 4 minutes a day. Least sunny months in Ilomantsi: January, November and December receive an average of 1 hours 12 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Ilomantsi. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours331232393444194954713632521335422
Mean daily daylight hours6h 1m8h 46m11h 50m14h 56m17h 57m19h 52m18h 49m15h 56m12h 53m9h 49m6h 51m5h 1m

Solar UV radiation in Ilomantsi, Finland

Ilomantsi 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 Ilomantsi UV Index data.

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