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December Weather in Siljan, Norway

Last updated: August 27, 2025

In Siljan, Norway, the average temperature in December hovers around -1°C (31°F). Expect a chilly range where minima can dip to -12°C (11°F) and maxima can reach up to 10°C (50°F). During this month, precipitation totals around 130 mm (5.1 in), typically falling over 16 days, while the average humidity remains a brisk 92%. Stay bundled up!

December Temperature in Siljan

In December in Siljan, the average temperature is -1°C (31°F), with maximums reaching 10°C (50°F) and minimums dropping as low as -12°C (11°F). It's advisable to prepare for cold weather conditions when traveling during this month.

December Weather in Siljan: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Siljan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Siljan, December typically has an average temperature of -1°C (31°F), with highs reaching up to 10°C (50°F) and lows dropping to around -12°C (11°F).
JanFebMarAprMayJunJulAugSepOctNovDec303034415160636054453731
Data source: Temperature data for Siljan generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Siljan

In Siljan in December, the precipitation amount is 130 mm (5.1 in) spread over 16 days.

December Precipitation Trends in Siljan

The chart displays monthly precipitation patterns in Siljan, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Siljan, December typically receives around 130 mm (5.1 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec76797939869410494126137116130
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Siljan

In Siljan in December humidity is 92%. With an average temperature of -1°C (31°F), this humidity feels like a heavy, damp chill that seeps into your bones, making travel uncomfortable and challenging as the cold air mixes with the moisture, creating a biting sensation that lingers long after stepping outside.

December Average Humidity in Siljan

This chart illustrates the average monthly humidity levels in Siljan, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Siljan is approximately 92%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%91%88%83%75%74%74%78%86%92%92%92%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Siljan

In Siljan in December, the maximum UV index is 1, which corresponds to a low Exposure Category. This means you have a time to burn of 45 minutes. For more details, you can check the Hourly UV Index in Siljan.

Maximum UV Index Levels in Siljan for December

The chart shows the monthly maximum UV Index (UVI) for Siljan in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Siljan typically reaches 1, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec113457754211
Data source: Siljan December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How December Weather in Siljan Compares to Other Months

Weather in Siljan varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Siljan, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Siljan, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)76 mm (3.0 inches)93%low
February Weather-1°C (30°F)79 mm (3.1 inches)91%low
March Weather1°C (35°F)79 mm (3.1 inches)88%moderate
April Weather5°C (42°F)39 mm (1.5 inches)83%moderate
May Weather10°C (51°F)86 mm (3.4 inches)75%moderate
June Weather16°C (60°F)94 mm (3.7 inches)74%high
July Weather17°C (63°F)104 mm (4.1 inches)74%high
August Weather16°C (60°F)94 mm (3.7 inches)78%moderate
September Weather12°C (54°F)126 mm (5.0 inches)86%moderate
October Weather7°C (46°F)137 mm (5.4 inches)92%low
November Weather3°C (38°F)116 mm (4.6 inches)92%low
December Weather-1°C (31°F)130 mm (5.1 inches)92%low

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