Trondheim weather in December

In December, Trondheim sees average daytime highs of 1°C and overnight lows near -4°C, with 94 mm of precipitation across 15.3 wet days and about 4.2 hours of daylight. It is the 10th-warmest and 5th-wettest month of the year here.

Day-to-day highs hold fairly steady near 1°C through the month. The sky is clear or mostly clear about 10% of the time in December, and the air most often feels dry.

Daylight stretches from about 4 h 54 min at the start of December to 4 h 12 min by month's end. Set against the rest of the year, December is Trondheim's 12th-clearest and 4th-windiest month. For the whole year in context, see Trondheim's year-round climate.

Daytime high
10th warmest
Overnight low
-4°
3rd coldest
Precipitation
94 mm
15.3 wet days
Daylight
4 h 06 min
10:13 AM – 2:17 PM
Cloud cover
77%
12th clearest
Wind
9 km/h
4th windiest
Solar energy
0.06 kWh/m²
Travel score
0.0
out of 10

Trondheim is city in Trøndelag, Norway.

Air quality
Good
PM2.5 5.7 µg/m³ · 2019
Density
3,766/km²
people per km²
Founded
~997 CE

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 1°C through the month.

A typical December day in Trondheim reaches about 1°C in the afternoon and slips back to -4°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between -5°C and 6°C. Set against its neighbours, December runs about 2°C cooler than November and on par with January.

-15°-10°-5°10°151015202531
Avg high (°C)Avg low (°C)
12-2
22-2
32-2
42-3
52-3
62-3
72-3
82-3
92-3
102-3
111-3
121-3
131-3
141-3
151-4
161-4
171-4
181-4
191-4
201-4
211-4
221-4
231-4
241-5
251-5
260-5
270-5
280-5
290-5
300-5
310-5

How December really feels in Trondheim

Once humidity and wind are folded in, December averages 0 days that feel above 32°C and 31 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
31
wind chill below the day's low

The story in December is cold — wind chill drags the overnight "feels like" below the raw low.

Trondheim weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -5°9615.912.75.20.0
Feb / -5°8414.211.98.10.0
Mar / -3°8815.410.811.20.1
Apr / 6713.65.414.51.6
May13° / 7015.61.417.73.2
Jun16° / 9515.6019.84.3
Jul19° / 11°8514.8018.95.3
Aug19° / 11°9914.9015.95.1
Sep14° / 10214.8012.73.6
Oct / 8715.22.89.41.3
Nov / -1°7913.27.36.20.0
Dec / -4°9415.310.74.20.0

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 10% of the time in December, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 10% of December, with mostly cloudy or overcast conditions the remaining 79%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12377
22377
32377
42377
52278
62377
72377
82377
92278
102179
112179
122179
132179
142080
152080
162080
172080
181981
192080
202080
211981
221981
231981
241981
252080
262080
271981
282179
292179
302278
312278

Chance of precipitation in December

Any precipitationSnow

Trondheim gets around 94 mm of rain and snow over 15.3 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 49% and peaks near 51% on the wettest days, and about 11 days bring snow.

0%20%40%60%151015202531
Rain chance (%)Snow chance (%)
14630
24630
34630
44730
54730
64730
74730
84830
94831
104931
114932
124932
135033
145034
155135
165135
175136
185137
195138
205139
215139
225139
235140
245140
255140
265040
275040
285040
294940
304940
314940

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

Most of December feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, December lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)
1100
2100
3100
4100
5100
6100
7100
8100
9100
10100
11100
12100
13100
14100
15100
16100
17100
18100
19100
20100
21100
22100
23100
24100
25100
26100
27100
28100
29100
30100
31100

Wind in December

Winds average 9 km/h in December.

Across December, daily wind ranges from about 9 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm
3110calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 4 h 54 min at the start of December to 4 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 42 minutes over December. Sunrise moves from 9:43 AM to 10:17 AM, and sunset from 2:34 PM to 2:26 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
14.99:432:34
24.89:452:32
34.79:482:30
44.69:502:29
54.69:522:27
64.59:552:26
74.59:572:24
84.49:592:23
94.310:012:22
104.310:032:21
114.210:052:20
124.210:072:19
134.210:082:18
144.110:102:17
154.110:112:17
164.110:132:17
174.010:142:16
184.010:152:16
194.010:162:16
204.010:172:16
214.010:172:17
224.010:182:17
234.010:182:17
244.010:182:18
254.010:192:19
264.010:192:20
274.010:192:21
284.110:182:22
294.110:182:23
304.110:172:25
314.210:172:26

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 0.06 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 0.06 kWh/m² to a high of 4.7 kWh/m² in June across the year — December's 0.06 kWh/m² sits near the bottom.

00.511.52151015202531
Solar energy (kWh/m²)Level
10.1Dim
20.1Dim
30.1Dim
40.1Dim
50.1Dim
60.1Dim
70.1Dim
80.1Dim
90.1Dim
100.1Dim
110.1Dim
120.1Dim
130.1Dim
140.1Dim
150.1Dim
160.1Dim
170.1Dim
180.1Dim
190.1Dim
200.1Dim
210.1Dim
220.1Dim
230.1Dim
240.1Dim
250.1Dim
260.1Dim
270.1Dim
280.1Dim
290.1Dim
300.1Dim
310.1Dim
Planning a trip in December

Is December a good time to visit Trondheim?

Our two travel scores rate December for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

0.0
Sightseeing
9th-best month of the year
0.0
Beach & pool
6th-best month of the year

December is a weaker month for outdoor sightseeing in Trondheim.

What to pack for Trondheim in December

From December's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In December, Trondheim sees daytime highs around 1°C and nights near -4°C. Pack a warm layer, a heavy coat and rain gear. About 15 days see rain.

a warm layera heavy coatrain gear

Sea temperature near Trondheim in December

The nearest coast averages about 7°C in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 55 km away) is warmest in August at about 14°C and coldest in March near 5°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

5°10°15°JanFebMarAprMayJunJulAugSepOctNovDecbracingcool
Sea temperature (°C)Comfort
Jan6Bracing
Feb6Bracing
Mar5Bracing
Apr6Bracing
May8Bracing
Jun10Bracing
Jul13Bracing
Aug14Bracing
Sep13Bracing
Oct11Bracing
Nov9Bracing
Dec7Bracing

UV index in Trondheim in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 0. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Trondheim peaks around July 13 at about 4 (moderate) — a little sun protection helps at midday. It bottoms out near January 1 at about 0 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 4 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateLowJul 13UV 4Jan 1UV 0
UV index (midday)Level
Jan0Low
Feb0Low
Mar1Low
Apr2Moderate
May4Moderate
Jun4Moderate
Jul5Moderate
Aug4Moderate
Sep2Low
Oct1Low
Nov0Low
Dec0Low
Location & terrain

Where is Trondheim?

Trondheim sits at 63.4°N, 10.4°E, 18 m above sea level, in Norway. The nearest listed city is Stjørdalshalsen, 27 km away.

MoldeÖstersundAlesundLillehammer

Topography around Trondheim

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Trondheim.

Within 3 km, the terrain around Trondheim has significant variations in elevation — a maximum elevation change of 312 m around an average of 52 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 558 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,431 m.

The land around Trondheim is covered by trees (33%), artificial surfaces (31%) and water (31%) within 3 km, water (48%) and trees (34%) within 16 km, and grassland (37%), trees (36%) and water (22%) within 80 km.

3 km
312 m
16 km
558 m
80 km
1,431 m
treesgrasslandcroplandartificial surfaceswatermoss and lichen
December weather nearby: Stjørdalshalsen 27 km · Levanger 57 km · Åre 134 km · Kristiansund 138 km · Molde 180 km · Östersund 214 km · Alesund 239 km · Lillehammer 257 km

Norway travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 91% of US
price level, 2025
GDP per capita
$94,594
2025
Happiness
7.2 / 10
World Happiness, 2025
Safe drinking water
99%
of population, 2024
Homicide rate
0.7
per 100k, 2023
Road deaths
2.1
per 100k/yr, 2019
Income group
High
World Bank
English
Very high
EF EPI 613
Religion
Church of Norway 68%other Christian 4%Muslim 3%Roman Catholic 3%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Trondheim (63.4305°, 10.3951°, elevation 18 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).