Norway
Trondheim in December: weather, sea & travel advice
This month's data profile
Rain shapes the decision
Trondheim in December is climatically mixed. The average daily high is around -1 °C, and the sea is about 7 °C. With about 20 rainy days it is very wet.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
9/100 · #11
Warmth
#10
Dryness
#11
Sun
#12
Sea warmth
#8
Published best categories: none
Trondheim · DecemberPhoto: David Stanley from Nanaimo, Canada · CC BY 4.0Climate facts
- Average high
- -1 °C
- Average low
- -5 °C
- Sea
- 7 °C
- Rainy days (est.)
- 20 rainy days (est.)
- Sun (est.)
- 0 h/day
- Humidity
- 96 %
Climate evidence with direct month comparison
The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Precipitation mm | Sun h/day (est.) | Humidity % | Wind m/s | Sea °C | Score |
|---|---|---|---|---|---|---|---|---|---|
| November | 1 | -2 | 17 | 116 | 0.3 | 95 | 1.1 | 9 | 12 |
| December (selected) | -1 | -5 | 20 | 135 | 0.1 | 96 | 1.5 | 7 | 9 |
| January | -2 | -6 | 20 | 138 | 0.2 | 96 | 1.8 | 6 | 9 |
How do the previous and next months compare?
Baseline: December (9/100)
Positive and negative values show the change from the selected month.
| Score Δ | Average high Δ | Average low Δ | Rainy days Δ | Rain Δ | Sun Δ | Humidity Δ | Wind Δ | Sea Δ | |
|---|---|---|---|---|---|---|---|---|---|
| November | +3 | +2.2 °C | +2.5 °C | -2.9 | -19 mm | +0.2 h | -1.3 % | -0.4 m/s | +1.4 °C |
| January | ±0 | -0.7 °C | -0.8 °C | -0.5 | +3.7 mm | +0.1 h | -0.5 % | +0.4 m/s | -1.2 °C |
All twelve months in context
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Useful next decisions
Frequently asked questions
How warm is Trondheim in December?
The average daily high is around -1 °C, with an average daily low of about -5 °C.
Can you swim in Trondheim in December?
The sea is about 7 °C (cold).
Does it rain a lot in Trondheim in December?
The curated estimate is about 20 rainy days per month, not a directly measured long-term average. Total precipitation averages around 135 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit Trondheim?
No month in Trondheim reaches the threshold for a clear recommendation in the climate score; the month comparison above shows the differences.