Siljan Weather in December
What's the weather like in Siljan (Telemark county) in December 2025?
The climate in Siljan during December can be summarized as cold and a little damp.
December is in the winter in Siljan and is typically the 3rd coldest month of the year. Daytime maximum temperatures average around a freezing -1°C (31°F), whilst at night -7°C (20°F) is normal.
| Daytime temperature | -0.9°C 30.5°F |
|---|---|
| Nightly temperature | -6.6°C 20.2°F |
| Average temperature | -3.7°C 25.3°F |
| Daily sunshine | 1 hrs |
| Avg rainfall | 81 mm 3.2 ins |
| Rainy days | 16 days |
| Sea temperature | 6.6°C 43.8°F |
| Humidity | 85% |
| Windspeed | 20.5kph 13 mph |
On average December is the 6th wettest month of the year in Siljan with around 81mm 3.2 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 16 days, although this may vary considerably.
On the flip side this corresponds to an average of 1 hours of sunshine per day.
December temperatures in Siljan
December rainfall
December hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Siljan in December 2025.
Other monthly averages
Best places to visit in December
Siljan weather stats
| Hottest month: | July | 19°C 66.2°F |
|---|---|---|
| Driest month: | April | 55mm 2.2ins |
| Sunniest month: | June | 9.4hrs |
| Coldest month: | January | -3°C 26.6°F |
| Wettest month: | October | 135mm 5.3ins |
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