December Weather in Trondheim, Norway

Last updated: August 27, 2025

December in Trondheim, Norway showcases a winter climate marked by temperatures that typically range from a brisk -16°C (3°F) to a mild 10°C (50°F). The average temperature hovers around -1°C (31°F), creating a chilly but picturesque atmosphere. With 105 mm (4.1 in) of precipitation spread over 15 days, expect a mix of snow and rain, contributing to a humid environment with levels soaring to 97%. This combination of cool temperatures and frequent precipitation sets the stage for a stunning, frosty landscape that defines Trondheim’s winter charm.

December Temperature in Trondheim

In December, Trondheim, Norway, unveils a chilly yet enchanting winter landscape, characterized by temperatures that dip to a frigid -16°C (3°F) at night and a modest daytime average hovering around -1°C (31°F). As the month unfolds, residents and visitors experience a gradual transition from the biting cold of November, where temperatures reached as low as -14°C (7°F), to more moderate conditions. The maximum temperature climbs to a crisp 10°C (50°F), providing a brief respite from the winter chill. Overall, December marks a significant part of Trondheim's winter, embodying the season's icy charm while hinting at the warmth of festive celebrations.

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

The chart illustrates December temperature patterns in Trondheim, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Trondheim, December typically has an average temperature of {2}°C ({3}°F), with highs reaching up to {4}°C ({5}°F) and lows dropping to around {6}°C ({7}°F).
JanFebMarAprMayJunJulAugSepOctNovDec292833404857605752433531
Data source: Temperature data for Trondheim generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Trondheim

In December, Trondheim experiences a precipitation total of 105 mm (4.1 in) across approximately 15 days, bringing the year to a soggy close. This month's rainfall is a notable increase compared to November's 88 mm (3.5 in), reflecting the region's trend of heightened precipitation as winter sets in. December's moisture levels, while significant, are consistent with the overall pattern observed throughout the year, marked by high figures in the late summer and autumn months. As the days grow shorter and colder, the steady precipitation not only blankets the ground with snow but also contributes to the city's enchanting winter landscape, setting the stage for the festive season.

December Precipitation Trends in Trondheim

The chart displays monthly precipitation patterns in Trondheim, 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 Trondheim, December typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec94751119470898811812412388105
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

December Humidity in Trondheim

As the year draws to a close, December brings the highest humidity levels to Trondheim, Norway, peaking at an impressive 97%. This rise in moisture marks a notable trend, with humidity consistently elevated throughout the winter months, ascending from 94% in February to its December climax. The gradual increase from 81% in July and June reflects Trondheim's characteristic shift towards a more humid climate as the seasons change. Interestingly, while summer months flaunt lower humidity levels, the autumn transition sees a steady rise, culminating in December's peak. This pattern underscores Trondheim's distinctive blend of cold, crisp winters and damp air, shaping its unique atmospheric backdrop.

December Average Humidity in Trondheim

This chart illustrates the average monthly humidity levels in Trondheim, 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 Trondheim is approximately {2}%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec96%94%91%86%83%81%81%88%90%93%95%97%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Trondheim

In December, Trondheim experiences a low UV Index of 1, similar to the preceding winter months of January and February, where exposure to ultraviolet rays remains minimal. With a burn time of 45 minutes, residents and visitors can enjoy the outdoors with limited risk of sunburn, making it an ideal time for winter activities. As the year progresses from winter to summer, the UV Index climbs significantly, peaking at 6 during the sunny months of June and July, where caution becomes necessary due to increased exposure risk. This trend highlights the importance of monitoring UV levels throughout the year in Trondheim. For detailed insights on the UV Index throughout the year, visit Trondheim UV Index.

Maximum UV Index Levels in Trondheim for December

The chart shows the monthly maximum UV Index (UVI) for Trondheim 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 Trondheim typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec112456653211
Data source: Trondheim 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.

December Sunshine in Trondheim

As December rolls into Trondheim, it brings a modest 60 hours of sunshine, marking a notable dip from the brighter months that follow. After basking in the glow of up to 431 hours in July, the city begins to face the darker days of winter. The trend is clear: as the year progresses from January's 57 hours towards the vibrant sprawl of spring, daylight peaks dramatically in April at 320 hours. However, December’s meager light serves as a gentle reminder of the seasonal shift, contrasting sharply with the hopeful increase in daylight that emerges as spring approaches. The gradual rise in sunlight throughout the early months of the year hints at the anticipation of brighter days ahead, making the eventual arrival of spring all the more cherished.

Monthly Sunshine Duration in Trondheim: December Highlighted

The December sunshine duration represents the total number of hours Trondheim experiences direct sunlight during the month of December, excluding cloudy or obstructed periods. This chart compares the sunshine duration of December with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec57h156h241h320h419h413h431h372h258h199h117h60h
Data source: Trondheim December Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Trondheim During December

In Trondheim, Norway, the likelihood of experiencing sunny weather in December stands at 25%, a figure that reflects the city’s colder and darker winter months. This percentage is a modest increase compared to the preceding months, such as October and November, where sunny days are less frequent, dipping to 14% and 20% respectively. As the year winds down, December brings a slight uptick in sunshine chances, positioning it better than the late autumn months but still revealing the region's overall trend of prolonged cloud cover as winter takes hold. With this in mind, while the prospect of basking in sunlight may be slim, the invigorating crispness of a clear December day can be a refreshing surprise for residents and visitors alike.

Percentage of Sunny Days in December in Trondheim

The chart illustrates the percentage of sunny days in Trondheim throughout the year, with December highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Trondheim experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec41%35%22%29%28%25%28%28%20%14%20%25%
Data source: Trondheim December chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Trondheim in December

In Trondheim, Norway, the transition through the months paints a vivid picture of changing daylight hours. The year begins with the bleakness of January, where daylight barely reaches 5 hours, gradually extending to 8 hours by February. As spring approaches, March brings a more promising 11 hours, culminating in the abundant light of April's 15 hours and May's 18 hours. The summer months peak in June, basking in almost 20 hours of daylight. However, this vibrant glow starts to wane as July (19 hours) flows into the warm hues of August (16 hours), draping the city in shorter days. As autumn sets in, September offers a respectable 12 hours, but daylight dwindles again to 9 hours in October and further declines to a mere 6 hours in November. By December, Trondheim faces its starkest challenge with just 4 hours of daylight, closing the year with a vivid reminder of nature's cycles. This rhythm not only highlights the beauty of seasonal change but also serves as a testament to the resilience needed to embrace the long winter ahead.

Average Daylight Hours in Trondheim for December

The chart illustrates the variation in daylight duration in Trondheim throughout the year, with December highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec5h 46m8h 40m11h 50m15h 3m18h 13m20h 19m19h 8m16h 5m12h 54m9h 44m6h 38m4h 41m
Data source: Trondheim daylight hours, calculated by summing the hours between sunrise and sunset for each day.

December Winds in Trondheim

In Trondheim, Norway, the December winds pick up slightly, with an average speed of 2.9 m/s (6 mph), marking a noticeable shift as the year comes to a close. This increase reflects a midwinter trend, where the winds gradually intensify from the calmer summer months—averaging as low as 1.9 m/s (4 mph) in both May and June. As autumn sets in, winds remain relatively steady, hovering around 2.5 to 2.7 m/s (6 mph) from October through November. The December breeze feels invigorating, hinting at the approach of winter while staying manageable, reminiscent of the gradual transitions seen throughout the year in this beautiful coastal town.

Average December Wind Speed in Trondheim

The chart displays monthly wind speed patterns in Trondheim, with values for each month shown alongside December's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how December's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec2.22.43.32.71.91.92.22.12.52.72.52.9 m/s
Data source: Trondheim December wind data, generated using information from the Copernicus Climate Change Service.

How December Weather in Trondheim Compares to Other Months

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

December and January showcase a notable similarity in their winter characteristics, yet there are distinct differences. In December, temperatures range from a minimum of -16°C (3°F) to a maximum of 10°C (50°F), with an average of -1°C (31°F). The month sees significant precipitation, totaling 105 mm (4.1 in) over 15 days, and high humidity levels at 97%. In contrast, January experiences slightly cooler conditions with temperatures dipping to a minimum of -18°C (-1°F) and averaging -2°C (29°F), while the maximum reaches 12°C (53°F). Precipitation decreases slightly to 94 mm (3.7 in) over 14 days, with humidity at 96%. This shift indicates a continuation of winter's grip with just a subtle change in weather patterns. For more detailed insights, check out Trondheim weather in January.

In December, temperatures in Trondheim typically range from a chilly minimum of -16°C (3°F) to a mild maximum of 10°C (50°F), with an average temperature near freezing at -1°C (31°F). The month experiences considerable precipitation, with 105 mm (4.1 in) falling over about 15 days, contributing to a high humidity level of 97%.

In contrast, February brings even colder temperatures, with minimums plunging to -25°C (-12°F), while still maintaining a maximum of 10°C (50°F) and an average close to -2°C (29°F). Precipitation decreases to 75 mm (3.0 in) over 13 days, accompanied by a slightly lower humidity of 94%. For a more detailed look at what to expect during this time, you can visit Trondheim weather in February.

In December, temperatures in Trondheim typically range from a minimum of -16°C (3°F) to a maximum of 10°C (50°F), with an average around -1°C (31°F). The month sees considerable precipitation, averaging 105 mm (4.1 in) over 15 days, and a high humidity level of 97%. In contrast, March experiences even colder temperatures, with a minimum of -24°C (-12°F) and a maximum reaching 14°C (58°F), yielding an average of 1°C (33°F). Interestingly, March has slightly higher precipitation at 111 mm (4.4 in) over 18 days, despite a lower humidity level of 91%. For more detailed insights, you can check this link: Trondheim weather in March.

December and April present contrasting weather conditions. In December, temperatures plunge with an average around -1°C (31°F), dipping as low as -16°C (3°F) and occasionally reaching a maximum of 10°C (50°F). The month is characterized by high humidity at 97%, and precipitation occurs on about 15 days, totaling 105 mm (4.1 in).

In contrast, April marks a transition to milder temperatures, where the average rises to 5°C (40°F), with lows of -12°C (11°F) and highs of 22°C (72°F). This month experiences slightly less precipitation at 93 mm (3.7 in) but has rainfall spread over 16 days, leading to a notable decrease in humidity to 86%. To delve deeper into the weather specifics for this month, you can check Trondheim weather in April.

December and May in Trondheim present a stark contrast in weather conditions. In December, temperatures can plummet as low as -16°C (3°F) with an average of -1°C (31°F), while the maximum rarely exceeds 10°C (50°F). The month is characterized by high precipitation at 105 mm (4.1 in) over 15 days, coupled with nearly constant humidity at 97%. In contrast, May sees a significant warming trend, with temperatures ranging from a minimum of -2°C (28°F) to a comfortable maximum of 27°C (80°F) and an average of 9°C (49°F). Precipitation decreases to 70 mm (2.7 in) over the same number of days, and humidity drops to a more moderate 83%. For a detailed look at the weather in May, you can check out Trondheim weather in May.

December and June present starkly contrasting weather conditions. In December, temperatures can plunge as low as -16°C (3°F), with an average of -1°C (31°F) and a maximum reaching only 10°C (50°F). This cold month also sees high humidity levels of 97% and considerable precipitation, averaging 105 mm (4.1 in) over 15 days.

In contrast, June brings a refreshing warmth, with temperatures starting at a minimum of 3°C (37°F), averaging 14°C (57°F) and peaking at a pleasant 32°C (89°F). The precipitation is lighter, totaling 89 mm (3.5 in) across 14 days, and the humidity is notably lower at 81%. This dramatic shift from winter's chill to summer's warmth makes June a much more inviting time of year. For more details, you can check out Trondheim weather in June.

The weather in December in Trondheim is characterized by cold temperatures, with a minimum of -16°C (3°F) and an average around -1°C (31°F), making it a stark contrast to the warm summer month of July, where temperatures range from a minimum of 5°C (41°F) to a maximum of 33°C (92°F). December experiences significant precipitation averaging 105 mm (4.1 in) over 15 days, coupled with high humidity levels at 97%. In contrast, July sees slightly less precipitation at 88 mm (3.5 in) over 16 days and enjoys a more moderate humidity level of 81%. For a closer look at July's climate specifics, visit Trondheim weather in July.

December and August present stark contrasts in weather. In December, temperatures range from a chilly -16°C (3°F) to a mild 10°C (50°F), with an average of -1°C (31°F), and high humidity at 97%. This month sees significant precipitation, totaling 105 mm (4.1 in) over about 15 days, often resulting in a wintry landscape. In sharp contrast, August enjoys much milder weather with temperatures fluctuating between 4°C (40°F) and a warm 31°C (88°F), averaging 14°C (58°F). Although it has slightly higher precipitation at 118 mm (4.6 in) over the same number of days, August's lower humidity at 88% contributes to a more comfortable atmosphere. For more insights on August weather, you can check Trondheim weather in August.

December weather is characterized by much colder temperatures, with a minimum of -16°C (3°F) and a maximum of only 10°C (50°F), averaging around -1°C (31°F). In contrast, September offers a milder climate, where temperatures range from a minimum of 2°C (36°F) to a maximum of 22°C (71°F), with an average of 11°C (52°F). Although December experiences slightly less precipitation, totaling 105 mm (4.1 in) over 15 days, September sees a higher total of 124 mm (4.9 in) across 17 days. Furthermore, humidity levels are notably higher in December at 97%, compared to 90% in September. For more details, you can check Trondheim weather in September.

December weather in Trondheim is much colder than in October, with average temperatures hovering around -1°C (31°F) compared to October's milder average of 6°C (44°F). While October experiences a maximum of 21°C (70°F), December's warmest day only reaches 10°C (50°F). Precipitation remains significant in both months, with December receiving 105 mm (4.1 in) over 15 days and October slightly higher at 123 mm (4.8 in) over 19 days. Humidity levels are also higher in December at 97%, compared to October's 93%. For more details on October weather, you can visit Trondheim weather in October.

December generally experiences colder temperatures compared to November, with average temperatures dropping from 2°C (36°F) in November to around -1°C (31°F) in December. The minimum temperature in December can plunge to -16°C (3°F), while November sees a slightly milder minimum of -14°C (7°F). In terms of precipitation, December is wetter, receiving 105 mm (4.1 in) versus November's 88 mm (3.5 in), and it also features more rainy days, with precipitation occurring on 15 days in December compared to 13 days in November. Humidity levels are slightly higher in December at 97%, compared to November's 95%. For more detailed insights, check out Trondheim weather in November.

Compare Trondheim's Climate with Cities Worldwide

Conclusion: What to Expect From December Weather in Trondheim

As December unfolds in Trondheim, the weather takes a notable turn, embracing the depths of winter. With average temperatures plummeting to around -1°C (31°F), it becomes significantly colder compared to the milder autumn months. The chill is compounded by high humidity levels reaching up to 97%, creating a damp and frosty atmosphere that can make it feel even colder. Precipitation is frequent, with around 15 days of rain or snow, accumulating to about 105 mm (4.1 in), which further differentiates December from the drier seasons earlier in the year. This combination of cold, moisture, and limited daylight defines Trondheim’s winter charm. For more insights on weather patterns, visit Trondheim Climate.