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Monthly climate in Lammi, Finland

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Lammi 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 -29 °C (-20 °F) or can rise to as high as 32 °C (89 °F). The average annual precipitation amounts to about 737 mm (29.0 inches) and receives 143 rainy days on the 1 mm (0.04 inches) threshold annually. Lammi enjoys an average of 3094 hours of sunshine throughout the year, and daylight varies from 5 hours 38 minutes to 19 hours 7 minutes per day.

Monthly average temperatures in Lammi, Finland

The warmest months in Lammi are June, July and August, with daily mean temperatures ranging from 16 to 17 °C (61 - 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 - 28 °F) throughout the day. On average each year, Lammi experiences 15 days above 25 °C (77.0 °F) and 137 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Lammi. 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)		11°C
(52°F)		22°C
(71°F)		28°C
(83°F)		32°C
(89°F)		31°C
(88°F)		31°C
(87°F)		23°C
(74°F)		18°C
(65°F)		12°C
(53°F)		6°C
(42°F)
Mean maximum4°C
(39°F)		4°C
(40°F)		10°C
(50°F)		17°C
(62°F)		25°C
(78°F)		26°C
(79°F)		28°C
(83°F)		26°C
(79°F)		21°C
(70°F)		15°C
(59°F)		10°C
(50°F)		4°C
(40°F)
Average high-2°C
(29°F)		-2°C
(29°F)		2°C
(36°F)		8°C
(46°F)		15°C
(59°F)		21°C
(69°F)		21°C
(71°F)		20°C
(68°F)		14°C
(58°F)		8°C
(47°F)		4°C
(39°F)		-1°C
(31°F)
Daily mean-4°C
(25°F)		-5°C
(24°F)		-2°C
(29°F)		3°C
(38°F)		10°C
(50°F)		16°C
(61°F)		17°C
(63°F)		16°C
(61°F)		11°C
(52°F)		6°C
(43°F)		2°C
(36°F)		-2°C
(28°F)
Average low-6°C
(21°F)		-8°C
(19°F)		-5°C
(22°F)		-1°C
(30°F)		4°C
(40°F)		11°C
(52°F)		12°C
(55°F)		12°C
(53°F)		8°C
(46°F)		4°C
(39°F)		0°C
(33°F)		-4°C
(25°F)
Mean minimum-20°C
(-3°F)		-19°C
(-2°F)		-17°C
(2°F)		-8°C
(18°F)		-2°C
(28°F)		5°C
(41°F)		8°C
(46°F)		6°C
(44°F)		1°C
(34°F)		-3°C
(26°F)		-8°C
(18°F)		-11°C
(12°F)
Minimum-25°C
(-13°F)		-29°C
(-20°F)		-25°C
(-14°F)		-13°C
(8°F)		-4°C
(25°F)		1°C
(33°F)		7°C
(44°F)		5°C
(41°F)		-2°C
(29°F)		-5°C
(22°F)		-11°C
(12°F)		-21°C
(-5°F)

Compare climate in Lammi with other places

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

Monthly average precipitation in Lammi, Finland

Lammi usually has the most precipitation in July, August and October, with an average of 14 rainy days and 81 mm (3.2 inches) of precipitation per month. The driest months in Lammi are February, March and April. On average, 44 mm (1.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Lammi. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)48 (1.9)42 (1.7)44 (1.7)47 (1.8)58 (2.3)69 (2.7)83 (3.3)81 (3.2)67 (2.6)78 (3.1)53 (2.1)67 (2.6)
Average precipitation days (≥ 1 mm)11911121011121412161114

Monthly sunshine hours in Lammi, Finland

The sunniest months in Lammi are May, June and July, when the sun shines an average of 14 hours 59 minutes a day. Least sunny months in Lammi: January, November and December receive an average of 1 hours 51 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Lammi. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours441372483484304794683882651578639
Mean daily daylight hours6h 30m9h 0m11h 51m14h 45m17h 29m19h 7m18h 13m15h 40m12h 49m9h 58m7h 15m5h 38m

Solar UV radiation in Lammi, Finland

Lammi 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 Lammi UV Index data.

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