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Mariehamn, Åland Islands climate
Cfb Oceanic / temperate
Mariehamn has a seasonal cold-temperate climate (Oceanic / temperate, Köppen Cfb). The hottest month is July with an average daily high near 69°F, while the coldest is February averaging around 22°F at night. Around 22 inches of precipitation falls each year, peaking in August (3.1 inches) and easing off in May (1.1 inches). At latitude 60°N, day length swings from 5.5 hours in midwinter to 18.5 hours at midsummer.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Mariehamn climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 34 | 33 | 38 | 46 | 56 | 63 | 69 | 68 | 60 | 49 | 42 | 37 |
| Avg temp (°F) | 29 | 28 | 32 | 39 | 48 | 56 | 62 | 60 | 53 | 44 | 38 | 33 |
| Avg low (°F) | 24 | 22 | 26 | 32 | 40 | 48 | 54 | 53 | 46 | 38 | 34 | 28 |
| Precipitation (in) | 1.5 | 1.1 | 1.6 | 1.2 | 1.1 | 2.2 | 1.9 | 3.1 | 2.2 | 2.9 | 1.7 | 1.7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 34 | 33 | 38 | 46 | 56 | 63 |
| Avg temp (°F) | 29 | 28 | 32 | 39 | 48 | 56 |
| Avg low (°F) | 24 | 22 | 26 | 32 | 40 | 48 |
| Precipitation (in) | 1.5 | 1.1 | 1.6 | 1.2 | 1.1 | 2.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 69 | 68 | 60 | 49 | 42 | 37 |
| Avg temp (°F) | 62 | 60 | 53 | 44 | 38 | 33 |
| Avg low (°F) | 54 | 53 | 46 | 38 | 34 | 28 |
| Precipitation (in) | 1.9 | 3.1 | 2.2 | 2.9 | 1.7 | 1.7 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 3 | 2 | 3 | 2 | 1 | 2 | 1 | 2 | 2 | 2 | 2 | 2 |
| Days with low ≤ 32°F (days) | 21 | 21 | 21 | 13 | 4 | 0.1 | — | — | 1 | 7 | 11 | 16 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 3 | 2 | 3 | 2 | 1 | 2 |
| Days with low ≤ 32°F (days) | 21 | 21 | 21 | 13 | 4 | 0.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 1 | 2 | 2 | 2 | 2 | 2 |
| Days with low ≤ 32°F (days) | — | — | 1 | 7 | 11 | 16 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 81 | 77 | 69 | 63 | 59 | 60 | 60 | 60 | 63 | 75 | 82 | 80 |
| Relative humidity (%) | 87 | 89 | 87 | 86 | 84 | 83 | 82 | 81 | 83 | 85 | 87 | 88 |
| Wind speed (mph) | 14.7 | 13.2 | 12.3 | 10.9 | 9.6 | 9.7 | 9.7 | 10.8 | 12.4 | 13.6 | 14.2 | 14.8 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 81 | 77 | 69 | 63 | 59 | 60 |
| Relative humidity (%) | 87 | 89 | 87 | 86 | 84 | 83 |
| Wind speed (mph) | 14.7 | 13.2 | 12.3 | 10.9 | 9.6 | 9.7 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 60 | 60 | 63 | 75 | 82 | 80 |
| Relative humidity (%) | 82 | 81 | 83 | 85 | 87 | 88 |
| Wind speed (mph) | 9.7 | 10.8 | 12.4 | 13.6 | 14.2 | 14.8 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 25 years of daily observations at Jomala Maarianhaminan Lentoase, a weather station, about 3 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.