Climate averages 1991–2020
Trondheim weather
in December.
A freezing month with heavy precipitation: the 11th warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a freezing month in Trondheim: daytime highs average -0.6°C and nights cool to about -5.7°C. By daytime temperature it is the 11th warmest of the 12 months.
Expect about 94 mm of precipitation on roughly 15 days, which makes December a month with heavy precipitation (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 4 h 45 min on an average December day.
The nearest other city in this atlas is Lillestrøm (388 km away). In December its highs average -0.7°C, about as warm as Trondheim, with 66 mm of precipitation.
Among the 8 cities listed in Norway, Trondheim ranks 7th of 8 for the warmest December highs and 5th of 8 for the driest December (precipitation, lowest first). The mean December high of those 8 cities is 1.4°C; Trondheim is 2.1°C cooler than that mean.
From December to January, average highs fall by 0.4°C to -1.1°C, and monthly precipitation rises from 94 mm to 96 mm.
The annual picture
December in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Trondheim climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -1.1°C-6.1°C | -6.1°C | 96 | 16.0 | 5.86 h |
| February | -0.5°C-6.1°C | -6.1°C | 86 | 14.5 | 8.69 h |
| March | 2.9°C-3.8°C | -3.8°C | 88 | 15.4 | 11.712 h |
| April | 7.8°C-0.4°C | -0.4°C | 67 | 13.6 | 14.915 h |
| May | 12.5°C3.8°C | 3.8°C | 70 | 15.6 | 18.118 h |
| June | 15.9°C8.1°C | 8.1°C | 95 | 15.6 | 20.320 h |
| July | 18.6°C10.8°C | 10.8°C | 85 | 14.8 | 19.319 h |
| August | 17.9°C10.6°C | 10.6°C | 99 | 14.9 | 16.316 h |
| September | 14.0°C7.3°C | 7.3°C | 102 | 14.8 | 13.113 h |
| October | 7.8°C2.2°C | 2.2°C | 87 | 15.2 | 9.910 h |
| November | 2.3°C-2.4°C | -2.4°C | 79 | 13.2 | 6.87 h |
| December, selected | -0.6°C-5.7°C | -5.7°C | 94 | 15.3 | 4.85 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
December in nearby cities
- Lillestrøm in DecemberNorway · 388 kmHigh -0.7°C · Low -5.0°C · 66 mm precipitation
- Oslo in DecemberNorway · 392 kmHigh -0.5°C · Low -4.8°C · 71 mm precipitation
- Drammen in DecemberNorway · 410 kmHigh -0.3°C · Low -4.9°C · 74 mm precipitation
- Bergen in DecemberNorway · 429 kmHigh 2.9°C · Low -0.7°C · 271 mm rain
- Gävle in DecemberSweden · 466 kmHigh 0.6°C · Low -3.3°C · 42 mm precipitation
- Fredrikstad in DecemberNorway · 469 kmHigh 2.2°C · Low -1.4°C · 70 mm rain
- Umeå in DecemberSweden · 489 kmHigh -0.8°C · Low -4.9°C · 62 mm precipitation
- Örebro in DecemberSweden · 528 kmHigh 1.0°C · Low -2.8°C · 49 mm precipitation
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Trondheim) is explained once on the Trondheim year overview and on the Sources, method and limits page.