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December Weather in Tretten, Norway

Last updated: August 27, 2025

In Tretten, Norway during December, the average temperature hovers around -7°C (20°F). Expect chilly conditions where the minimum can plummet to -23°C (-9°F), while the maximum may reach 4°C (40°F). You’ll also experience significant precipitation, averaging 83 mm (3.3 in) spread over 16 days. With an average humidity of 98%, it’s a month best suited for those who embrace the cold!

December Temperature in Tretten

In December in Tretten, the average temperature is -7°C (20°F). The maximum can reach 4°C (40°F), while the minimum can drop as low as -23°C (-9°F). Be prepared for chilly weather and pack accordingly if you plan to travel during this time.

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

The chart illustrates December temperature patterns in Tretten, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Tretten, December typically has an average temperature of -7°C (20°F), with highs reaching up to 4°C (40°F) and lows dropping to around -23°C (-9°F).
JanFebMarAprMayJunJulAugSepOctNovDec192027334455575346372720
Data source: Temperature data for Tretten 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 Tretten

In Tretten in December, the precipitation amount is 83 mm (3.3 in), occurring over a period of 16 days.

December Precipitation Trends in Tretten

The chart displays monthly precipitation patterns in Tretten, 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 Tretten, December typically receives around 83 mm (3.3 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec535152348498100127951168883
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Tretten

In Tretten in December humidity is 98%. With an average temperature of -7°C (20°F), this humidity feels like a cold, biting chill that seeps into your bones, making outdoor adventures uncomfortable and travel cumbersome as frosty air combines with thick moisture to create an atmosphere that's both harsh and damp.

December Average Humidity in Tretten

This chart illustrates the average monthly humidity levels in Tretten, 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 Tretten is approximately 98%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec98%95%92%88%84%82%82%87%91%95%97%98%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Tretten

In Tretten 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 Tretten.

Maximum UV Index Levels in Tretten for December

The chart shows the monthly maximum UV Index (UVI) for Tretten 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 Tretten typically reaches 1, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec113467754211
Data source: Tretten 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 Tretten Compares to Other Months

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

This table compares monthly weather conditions in Tretten, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-7°C (19°F)53 mm (2.1 inches)98%low
February Weather-7°C (20°F)51 mm (2.0 inches)95%low
March Weather-3°C (27°F)52 mm (2.0 inches)92%moderate
April Weather1°C (34°F)34 mm (1.3 inches)88%moderate
May Weather7°C (44°F)84 mm (3.3 inches)84%high
June Weather13°C (55°F)98 mm (3.8 inches)82%high
July Weather14°C (57°F)100 mm (3.9 inches)82%high
August Weather12°C (54°F)127 mm (5.0 inches)87%moderate
September Weather8°C (46°F)95 mm (3.8 inches)91%moderate
October Weather3°C (37°F)116 mm (4.6 inches)95%low
November Weather-3°C (28°F)88 mm (3.5 inches)97%low
December Weather-7°C (20°F)83 mm (3.3 inches)98%low

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