Climate averages 1991–2020
Mariehamn weather
in January.
A cold month with moderate precipitation: the 11th warmest and the 5th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a cold month in Mariehamn: daytime highs average 1.0°C and nights cool to about -1.6°C. By daytime temperature it is the 11th warmest of the 12 months.
Expect about 43 mm of precipitation on roughly 11 days, which makes January a month with moderate precipitation (the 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 6 h 46 min on an average January day.
The nearest other city in this atlas is Uppsala (130 km away). In January its highs average -0.4°C, 1.4°C cooler than Mariehamn, with 34 mm of precipitation.
From January to February, average highs fall by 1.2°C to -0.2°C, and monthly precipitation falls from 43 mm to 29 mm.
The annual picture
January in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Mariehamn climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January, selected | 1.0°C-1.6°C | -1.6°C | 43 | 10.5 | 6.87 h |
| February | -0.2°C-2.9°C | -2.9°C | 29 | 7.8 | 9.19 h |
| March | 1.5°C-1.5°C | -1.5°C | 27 | 7.1 | 11.712 h |
| April | 5.2°C1.8°C | 1.8°C | 29 | 6.9 | 14.515 h |
| May | 9.7°C6.1°C | 6.1°C | 33 | 6.6 | 17.117 h |
| June | 14.5°C10.9°C | 10.9°C | 49 | 7.5 | 18.719 h |
| July | 18.4°C15.1°C | 15.1°C | 48 | 7.6 | 18.018 h |
| August | 18.3°C15.4°C | 15.4°C | 55 | 10.2 | 15.716 h |
| September | 14.3°C11.8°C | 11.8°C | 54 | 9.2 | 13.013 h |
| October | 9.1°C7.0°C | 7.0°C | 62 | 11.8 | 10.210 h |
| November | 5.3°C3.2°C | 3.2°C | 60 | 13.0 | 7.68 h |
| December | 2.8°C0.4°C | 0.4°C | 56 | 13.0 | 6.06 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
January in nearby cities
- Uppsala in JanuarySweden · 130 kmHigh -0.4°C · Low -4.7°C · 34 mm precipitation
- Sollentuna in JanuarySweden · 134 kmHigh 0.0°C · Low -3.8°C · 35 mm precipitation
- Turku in JanuaryFinland · 135 kmHigh -1.5°C · Low -6.0°C · 49 mm precipitation
- Stockholm in JanuarySweden · 135 kmHigh 0.4°C · Low -3.2°C · 36 mm precipitation
- Haninge in JanuarySweden · 144 kmHigh 0.3°C · Low -3.2°C · 39 mm precipitation
- Huddinge in JanuarySweden · 146 kmHigh 0.4°C · Low -3.2°C · 36 mm precipitation
- Södertälje in JanuarySweden · 164 kmHigh 0.1°C · Low -4.0°C · 36 mm precipitation
- Gävle in JanuarySweden · 166 kmHigh -0.7°C · Low -5.2°C · 33 mm precipitation
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Mariehamn) is explained once on the Mariehamn year overview and on the Sources, method and limits page.