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Monthly climate in Posio, Finland

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Posio features a subarctic climate (Dfc). Temperatures typically range between -10 °C (14 °F) and 15 °C (60 °F) through the year, but rarely can drop to -28 °C (-18 °F) or can rise to as high as 29 °C (84 °F). The average annual precipitation amounts to about 784 mm (30.9 inches) and receives 155 rainy days on the 1 mm (0.04 inches) threshold annually. Posio enjoys an average of 2849 hours of sunshine throughout the year, and daylight varies from 2 hours 59 minutes to 23 hours 30 minutes per day.

Monthly average temperatures in Posio, Finland

The warmest months in Posio are June, July and August, with daily mean temperatures ranging from 12 to 15 °C (55 - 60 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -10 to -7 °C (14 - 20 °F) throughout the day. On average each year, Posio experiences 4 days above 25 °C (77.0 °F) and 190 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Posio. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum3°C
(38°F)		4°C
(39°F)		7°C
(45°F)		16°C
(60°F)		24°C
(76°F)		26°C
(79°F)		29°C
(84°F)		29°C
(84°F)		21°C
(71°F)		14°C
(58°F)		7°C
(45°F)		2°C
(37°F)
Mean maximum1°C
(34°F)		1°C
(34°F)		4°C
(40°F)		11°C
(52°F)		19°C
(66°F)		23°C
(73°F)		26°C
(80°F)		23°C
(74°F)		18°C
(64°F)		11°C
(52°F)		5°C
(41°F)		1°C
(34°F)
Average high-7°C
(19°F)		-8°C
(19°F)		-2°C
(28°F)		3°C
(38°F)		9°C
(48°F)		16°C
(61°F)		19°C
(67°F)		16°C
(61°F)		10°C
(51°F)		3°C
(38°F)		-1°C
(30°F)		-5°C
(24°F)
Daily mean-10°C
(14°F)		-10°C
(14°F)		-6°C
(21°F)		-0°C
(32°F)		5°C
(41°F)		12°C
(55°F)		15°C
(60°F)		12°C
(55°F)		7°C
(46°F)		2°C
(35°F)		-3°C
(27°F)		-7°C
(20°F)
Average low-13°C
(10°F)		-13°C
(8°F)		-10°C
(14°F)		-4°C
(24°F)		1°C
(33°F)		8°C
(46°F)		11°C
(52°F)		9°C
(48°F)		4°C
(40°F)		-0°C
(32°F)		-5°C
(24°F)		-9°C
(16°F)
Mean minimum-24°C
(-11°F)		-23°C
(-9°F)		-21°C
(-5°F)		-12°C
(11°F)		-6°C
(21°F)		4°C
(39°F)		4°C
(40°F)		3°C
(37°F)		-2°C
(29°F)		-10°C
(14°F)		-16°C
(4°F)		-20°C
(-4°F)
Minimum-28°C
(-18°F)		-27°C
(-16°F)		-25°C
(-14°F)		-15°C
(6°F)		-8°C
(19°F)		-2°C
(29°F)		4°C
(39°F)		-0°C
(32°F)		-5°C
(23°F)		-14°C
(6°F)		-20°C
(-3°F)		-24°C
(-10°F)

Compare climate in Posio with other places

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

Monthly average precipitation in Posio, Finland

Posio usually has the most precipitation in June, August and October, with an average of 15 rainy days and 92 mm (3.6 inches) of precipitation per month. The driest months in Posio are January, February and April. On average, 42 mm (1.7 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Posio. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)43 (1.7)40 (1.6)44 (1.7)43 (1.7)49 (1.9)85 (3.4)76 (3.0)110 (4.3)82 (3.2)82 (3.2)71 (2.8)58 (2.3)
Average precipitation days (≥ 1 mm)1191291014121714151616

Monthly sunshine hours in Posio, Finland

The sunniest months in Posio are May, June and July, when the sun shines an average of 15 hours 0 minutes a day. Least sunny months in Posio: January, November and December receive an average of 0 hours 49 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Posio. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours24116251337426469483353230103437
Mean daily daylight hours4h 34m8h 11m11h 48m15h 28m19h 25m23h 30m20h 53m16h 42m13h 1m9h 25m5h 44m2h 59m

Solar UV radiation in Posio, Finland

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

Average daily maximum UV levels by month for Posio. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)112356643211