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Monthly climate in Alastaro, Finland

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Alastaro features a subarctic climate (Dfc). Temperatures typically range between -4 °C (25 °F) and 17 °C (64 °F) through the year, but rarely can drop to -27 °C (-16 °F) or can rise to as high as 32 °C (89 °F). The average annual precipitation amounts to about 694 mm (27.3 inches) and receives 131 rainy days on the 1 mm (0.04 inches) threshold annually. Alastaro enjoys an average of 3262 hours of sunshine throughout the year, and daylight varies from 5 hours 39 minutes to 19 hours 5 minutes per day.

Monthly average temperatures in Alastaro, Finland

The warmest months in Alastaro are June, July and August, with daily mean temperatures ranging from 16 to 17 °C (61 - 64 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -4 to -1 °C (25 - 30 °F) throughout the day. On average each year, Alastaro experiences 14 days above 25 °C (77.0 °F) and 133 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Alastaro. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum8°C
(46°F)		7°C
(45°F)		12°C
(55°F)		21°C
(70°F)		28°C
(82°F)		31°C
(89°F)		32°C
(89°F)		30°C
(86°F)		24°C
(76°F)		18°C
(65°F)		13°C
(56°F)		6°C
(43°F)
Mean maximum4°C
(40°F)		5°C
(41°F)		10°C
(51°F)		17°C
(62°F)		24°C
(76°F)		26°C
(79°F)		28°C
(83°F)		26°C
(79°F)		21°C
(71°F)		15°C
(59°F)		10°C
(51°F)		5°C
(42°F)
Average high-1°C
(31°F)		-1°C
(30°F)		3°C
(38°F)		9°C
(48°F)		15°C
(59°F)		21°C
(70°F)		22°C
(71°F)		20°C
(68°F)		15°C
(59°F)		9°C
(48°F)		4°C
(40°F)		0°C
(33°F)
Daily mean-3°C
(27°F)		-4°C
(25°F)		-1°C
(31°F)		4°C
(39°F)		10°C
(50°F)		16°C
(61°F)		17°C
(64°F)		16°C
(61°F)		11°C
(53°F)		6°C
(44°F)		3°C
(37°F)		-1°C
(30°F)
Average low-5°C
(23°F)		-7°C
(19°F)		-5°C
(24°F)		-1°C
(31°F)		4°C
(40°F)		11°C
(51°F)		12°C
(55°F)		12°C
(53°F)		8°C
(46°F)		4°C
(39°F)		1°C
(33°F)		-3°C
(27°F)
Mean minimum-17°C
(1°F)		-19°C
(-2°F)		-16°C
(4°F)		-8°C
(18°F)		-3°C
(27°F)		5°C
(41°F)		7°C
(45°F)		6°C
(42°F)		1°C
(34°F)		-5°C
(24°F)		-7°C
(20°F)		-10°C
(14°F)
Minimum-25°C
(-12°F)		-25°C
(-12°F)		-27°C
(-16°F)		-13°C
(10°F)		-4°C
(25°F)		2°C
(36°F)		5°C
(41°F)		5°C
(41°F)		-2°C
(29°F)		-7°C
(19°F)		-10°C
(15°F)		-20°C
(-4°F)

Compare climate in Alastaro with other places

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

Monthly average precipitation in Alastaro, Finland

Alastaro usually has the most precipitation in July, August and October, with an average of 13 rainy days and 80 mm (3.2 inches) of precipitation per month. The driest months in Alastaro 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 Alastaro. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)46 (1.8)42 (1.6)43 (1.7)38 (1.5)50 (2.0)57 (2.2)83 (3.3)83 (3.3)59 (2.3)75 (3.0)54 (2.1)64 (2.5)
Average precipitation days (≥ 1 mm)9810101010111312151013

Monthly sunshine hours in Alastaro, Finland

The sunniest months in Alastaro are May, June and July, when the sun shines an average of 15 hours 22 minutes a day. Least sunny months in Alastaro: January, November and December receive an average of 2 hours 15 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Alastaro. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours4815326134844649047741028517910257
Mean daily daylight hours6h 32m9h 1m11h 51m14h 44m17h 27m19h 5m18h 12m15h 39m12h 49m9h 58m7h 16m5h 39m

Solar UV radiation in Alastaro, Finland

Alastaro 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 Alastaro UV Index data.

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