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Monthly climate in Yli-Ii, Finland

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Yli-Ii features a subarctic climate (Dfc). Temperatures typically range between -9 °C (17 °F) and 17 °C (63 °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 754 mm (29.7 inches) and receives 136 rainy days on the 1 mm (0.04 inches) threshold annually. Yli-Ii enjoys an average of 3200 hours of sunshine throughout the year, and daylight varies from 3 hours 34 minutes to 22 hours 3 minutes per day.

Monthly average temperatures in Yli-Ii, Finland

The warmest months in Yli-Ii are June, July and August, with daily mean temperatures ranging from 14 to 17 °C (58 - 63 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -9 to -5 °C (17 - 23 °F) throughout the day. On average each year, Yli-Ii experiences 8 days above 25 °C (77.0 °F) and 173 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Yli-Ii. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum5°C
(41°F)		5°C
(41°F)		7°C
(45°F)		14°C
(57°F)		27°C
(80°F)		30°C
(86°F)		32°C
(90°F)		30°C
(87°F)		24°C
(75°F)		16°C
(62°F)		9°C
(49°F)		4°C
(39°F)
Mean maximum2°C
(37°F)		3°C
(38°F)		6°C
(42°F)		11°C
(53°F)		22°C
(73°F)		25°C
(77°F)		28°C
(83°F)		26°C
(78°F)		19°C
(67°F)		13°C
(55°F)		7°C
(45°F)		3°C
(37°F)
Average high-5°C
(22°F)		-6°C
(22°F)		-1°C
(31°F)		4°C
(40°F)		11°C
(52°F)		18°C
(65°F)		21°C
(70°F)		18°C
(65°F)		13°C
(55°F)		6°C
(43°F)		1°C
(34°F)		-3°C
(27°F)
Daily mean-8°C
(18°F)		-9°C
(17°F)		-4°C
(25°F)		1°C
(34°F)		7°C
(45°F)		14°C
(58°F)		17°C
(63°F)		14°C
(58°F)		9°C
(49°F)		4°C
(39°F)		-1°C
(30°F)		-5°C
(23°F)
Average low-11°C
(13°F)		-12°C
(11°F)		-8°C
(18°F)		-3°C
(26°F)		2°C
(36°F)		9°C
(48°F)		12°C
(53°F)		10°C
(51°F)		6°C
(43°F)		1°C
(35°F)		-3°C
(26°F)		-7°C
(19°F)
Mean minimum-27°C
(-16°F)		-23°C
(-9°F)		-20°C
(-4°F)		-11°C
(12°F)		-5°C
(24°F)		5°C
(41°F)		6°C
(42°F)		3°C
(38°F)		-1°C
(30°F)		-10°C
(14°F)		-14°C
(7°F)		-20°C
(-4°F)
Minimum-31°C
(-24°F)		-26°C
(-15°F)		-26°C
(-14°F)		-14°C
(7°F)		-7°C
(20°F)		1°C
(34°F)		4°C
(40°F)		1°C
(34°F)		-5°C
(24°F)		-15°C
(5°F)		-18°C
(-1°F)		-26°C
(-15°F)

Compare climate in Yli-Ii with other places

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

Monthly average precipitation in Yli-Ii, Finland

Yli-Ii usually has the most precipitation in July, August and October, with an average of 13 rainy days and 86 mm (3.4 inches) of precipitation per month. The driest months in Yli-Ii are January, February and April. On average, 43 mm (1.7 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Yli-Ii. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)45 (1.8)42 (1.7)46 (1.8)41 (1.6)51 (2.0)66 (2.6)77 (3.0)95 (3.7)76 (3.0)86 (3.4)67 (2.6)63 (2.5)
Average precipitation days (≥ 1 mm)10912799101512151315

Monthly sunshine hours in Yli-Ii, Finland

The sunniest months in Yli-Ii are May, June and July, when the sun shines an average of 16 hours 4 minutes a day. Least sunny months in Yli-Ii: January, November and December receive an average of 1 hours 18 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Yli-Ii. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours331322693644535155094072791476720
Mean daily daylight hours4h 57m8h 19m11h 48m15h 21m19h 2m22h 3m20h 14m16h 31m12h 59m9h 31m6h 1m3h 34m

Solar UV radiation in Yli-Ii, Finland

Yli-Ii experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 4 - 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 Yli-Ii UV Index data.

Average daily maximum UV levels by month for Yli-Ii. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)112346643211