January weather forecast
Mariehamn Airport, Finland

January in Mariehamn Airport, Finland, is characterized by a chill in the air and frequent rainfall. Temperatures drop drastically from December, from both a high and a low perspective. A low-temperature threshold is set in January, a spell of cold is felt all throughout, with the mercury plunging to an extreme of -7°C (19.4°F). As the new year sets in, daylight hours come in short supply, making the days seem shorter. The UV index is at its lowest, emphasizing the absence of the warm, comforting sunshine.

Temperature

The shift into January records an average high-temperature of a freezing cold -1°C (30.2°F), subtly varied from December's 1°C (33.8°F). In Mariehamn Airport, an average nighttime temperature of -7°C (19.4°F) is expected during January.

Rainfall

In Mariehamn Airport, in January, during 20 rainfall days, 36mm (1.42") of precipitation is typically accumulated. Throughout the year, in Mariehamn Airport, Finland, there are 176 rainfall days, and 508mm (20") of precipitation is accumulated.

Sea temperature

In Mariehamn Airport, in January, the average water temperature is 2°C (35.6°F).
Note: In swimming, this scenario poses immediate life-threatening danger. Breathing control is totally lost and logical thinking nearly impossible. Wearing a specialized swimsuit is critical to limit thermal loss.

Daylight

The average length of the day in January in Mariehamn Airport is 6h and 50min.
On the first day of the month, sunrise is at 09:43 and sunset at 15:43. On the last day of January, in Mariehamn Airport, sunrise is at 08:57 and sunset at 16:49 EET.

Sunshine

The months with the least sunshine are January, February, November and December, with an average of 1h of sunshine.

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 0. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: The maximum daily UV index of 0 in January interprets into the following recommendations:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.