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Monthly climate in Isojoki, South Ostrobothnia, Finland

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Isojoki features a subarctic climate (Dfc).Temperatures typically range between -5 °C (24 °F) and 17 °C (63 °F) through the year, but rarely can drop to -28 °C (-19 °F) or can rise to as high as 32 °C (91 °F).The average annual precipitation amounts to about 791 mm (31.1 inches) and receives 135 rainy days on the 1 mm (0.04 inches) threshold annually.Isojoki enjoys an average of 3301 hours of sunshine throughout the year, and daylight varies from 5 hours 15 minutes to 19 hours 35 minutes per day.

Monthly average temperatures in Isojoki, South Ostrobothnia, Finland §

The warmest months in Isojoki 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 -5 to -2 °C (24 - 29 °F) throughout the day. On average each year, Isojoki experiences 15 days above 25 °C (77.0 °F) and 146 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Isojoki, South Ostrobothnia, Finland.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 8°C
(46°F)		 7°C
(45°F)		 11°C
(53°F)		 22°C
(71°F)		 28°C
(83°F)		 31°C
(89°F)		 32°C
(91°F)		 30°C
(86°F)		 24°C
(76°F)		 18°C
(64°F)		 12°C
(53°F)		 5°C
(42°F)
Mean maximum 5°C
(40°F)		 5°C
(41°F)		 9°C
(48°F)		 16°C
(61°F)		 25°C
(77°F)		 27°C
(81°F)		 29°C
(84°F)		 25°C
(78°F)		 21°C
(70°F)		 15°C
(59°F)		 9°C
(49°F)		 5°C
(41°F)
Average high -2°C
(30°F)		 -2°C
(29°F)		 2°C
(36°F)		 8°C
(46°F)		 14°C
(58°F)		 20°C
(69°F)		 22°C
(72°F)		 20°C
(68°F)		 14°C
(58°F)		 8°C
(47°F)		 4°C
(39°F)		 -0°C
(32°F)
Daily mean -4°C
(26°F)		 -5°C
(24°F)		 -2°C
(29°F)		 3°C
(38°F)		 9°C
(49°F)		 16°C
(61°F)		 17°C
(63°F)		 15°C
(60°F)		 11°C
(51°F)		 6°C
(42°F)		 2°C
(35°F)		 -2°C
(29°F)
Average low -6°C
(21°F)		 -8°C
(18°F)		 -6°C
(22°F)		 -2°C
(30°F)		 3°C
(38°F)		 10°C
(50°F)		 12°C
(53°F)		 11°C
(51°F)		 7°C
(45°F)		 3°C
(38°F)		 -0°C
(32°F)		 -4°C
(25°F)
Mean minimum -19°C
(-3°F)		 -19°C
(-1°F)		 -17°C
(2°F)		 -10°C
(14°F)		 -3°C
(26°F)		 5°C
(41°F)		 6°C
(44°F)		 4°C
(39°F)		 -0°C
(32°F)		 -6°C
(21°F)		 -8°C
(18°F)		 -12°C
(11°F)
Minimum -26°C
(-14°F)		 -24°C
(-10°F)		 -28°C
(-19°F)		 -16°C
(3°F)		 -5°C
(23°F)		 0°C
(33°F)		 5°C
(42°F)		 2°C
(36°F)		 -2°C
(29°F)		 -10°C
(15°F)		 -13°C
(8°F)		 -24°C
(-11°F)

Compare climate in Isojoki with other places

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

Monthly average precipitation in Isojoki, South Ostrobothnia, Finland §

Isojoki usually has the most precipitation in July, August and October, with an average of 13 rainy days and 93 mm (3.7 inches) of precipitation per month.The driest months in Isojoki are January, February and April. On average, 45 mm (1.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Isojoki, South Ostrobothnia, Finland.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 43 (1.7) 46 (1.8) 48 (1.9) 46 (1.8) 47 (1.8) 69 (2.7) 87 (3.4) 113 (4.5) 77 (3.0) 80 (3.1) 68 (2.7) 67 (2.6)
Average precipitation days (≥ 1 mm) 11 8 10 10 9 10 11 15 12 14 11 14

Monthly sunshine hours in Isojoki, South Ostrobothnia, Finland §

The sunniest months in Isojoki are May, June and July, when the sun shines an average of 15 hours 38 minutes a day.Least sunny months in Isojoki: January, November and December receive an average of 2 hours 12 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Isojoki, South Ostrobothnia, Finland.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 50 154 263 352 454 499 484 416 287 185 100 51
Mean daily daylight hours 6h 12m 8h 52m 11h 50m 14h 52m 17h 47m 19h 35m 18h 35m 15h 50m 12h 51m 9h 52m 7h 0m 5h 15m

Solar UV radiation in Isojoki, South Ostrobothnia, Finland §

Isojoki 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 Isojoki UV Index data.

Average daily maximum UV levels by month for Isojoki, South Ostrobothnia, Finland.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 1 1 3 4 5 6 6 5 3 2 1 1