Weather in Mariehamn in December 2024
Average weather
Average temperature in Mariehamn in December
Going from a maximum of +6°C during the day to a minimum of -7°C during the night, the temperature in December averages around +1°C.
The average maximum temperature goes down 15% by the end of the month, compared with the beginning of the month, from -1°C to -3°C.
Is Mariehamn warm or cold in December?
Mariehamn is typically cool in December.
Maximum temperatures go down compared to the previous month from +5°C to +2°C. The minimum temperature also goes down from +2°C to -1°C.
Pack a sweater and a jacket as there will be cooler temperatures.
Take a look at how December is compared to other months in Mariehamn:
Climate in Mariehamn in December
| November | December | January | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +5°C | +2°C | 0°C | ||||
| Min. temperature | ||||||
| -11°C | -15°C | -28°C | ||||
| Max. temperature | ||||||
| +16°C | +11°C | +9°C | ||||
| Rainfall | ||||||
| 49 mm | 28 mm | 16 mm | ||||
| Wind | ||||||
| 7 m/s | 7 m/s | 7 m/s | ||||
| Humidity | ||||||
| 82% | 82% | 83% | ||||
| Air pressure | ||||||
| 1010 HPa | 1008 HPa | 1009 HPa | ||||
| Sunny days | ||||||
| 1 | 1 | 1 | ||||
| Cloudy days | ||||||
| 9 | 10 | 12 | ||||
| Rainy days | ||||||
| 14 | 8 | 4 | ||||
| Snowy days | ||||||
| 6 | 12 | 13 | ||||
December weather is still as ok as in November. It’s getting colder in December. From +5°C in the day, the average maximum temperature lowers to +2°C. As December arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 49 mm to 28 mm. Humidity levels don’t change as the month goes on, averaging around 82%. The average wind speed doesn’t change much during December, staying around 7 m/s. The amount of sunny days stay about the same, averaging 1 sunny days during the month.
January brings much the same weather, it remains ok.
Wind
The average wind speed is 4 m/s getting up to 7 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Mariehamn is gradually decreasing during December, going from 6 m/s to 4 m/s over the course of the month.
Rain
Snow
December is one of the snowiest months in Mariehamn.
Here’s how December is compared with other months in the amount of snow, total mm:
How was the weather last December in Mariehamn?
Climate Change over Years
The climate in Mariehamn in December has not changed much over the last 43 years.
The average temperature was the lowest in 1987 (+5°C) and the highest in 2020 (+11°C). The driest year was 2018 with only 269 mm of rainfall, and the wettest year was 2020 with 612 mm.
FAQ
Is December a good time to visit Mariehamn?
Can you sunbathe in Mariehamn in December?
Is Mariehamn rainy in December?
Is it sunny in Mariehamn in December?
Monthly weather in Mariehamn
Source of the data
For this page, we’ve looked at the typical weather in Mariehamn, based on historical hourly weather data from January 1, 1979, to December 31, 2022.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.