Trondheim climate — normals and trends
Trondheim (Norway) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 4.6 °C and it receives 1,048 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is July (14.6 °C on average) and the coldest is January (-5.0 °C). Rainfall peaks in September.
Trondheim averages 144 frost days, 1 hot days (≥ 30 °C) and 183 rainy days per year.
Trondheim has warmed by +4.1 °C between 1940 and 2025, or +0.48 °C per decade. This trend is statistically significant.
The number of frost days there went from about 181 to 107 per year over the period.
The hottest day of the period reached 33.4 °C (on 27 July 2019) and the coldest -34.8 °C (on 1 January 1979).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
TrondheimTrøndelag
- coords
- 63.43°, 10.40°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
4.6°C
Average daily high
7.9°C
Average daily low
1.3°C
Annual rainfall
1,048mm
Sunshine / day
6.9h
Mean relative humidity
79%
Average peak wind
12.9km/h
Seasonal range
19.6°C
Frost days (< 0 °C)
144 d/yr
Hot days (≥ 30 °C)
1 d/yr
Rainy days (≥ 1 mm)
183 d/yr
Annual snowfall
194.5 cm
Average feels-like high
5.1 °C
Average feels-like low
-1.8 °C
Average peak gust
33.4 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
8.1 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+4.1 °C
since 1940
+0.5 °C per decade · r² = 0.63 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
33.4 °C
27 July 2019
Coldest day
-34.8 °C
1 January 1979
Wettest day
50 mm
27 December 1975
Windiest day
50.1 km/h
1 January 1992
Strongest gust
145.8 km/h
1 January 1992
Hottest feels-like
34.5 °C
27 July 2019
Coldest feels-like
-39.6 °C
1 January 1979
Snowiest day
20.7 cm
4 February 1993
Sunniest day
19.2 h
15 June 2024
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 1.4 °C | +3.9 °C | 69 mm | -17 mm |
| Feb | 3.6 °C | +4.8 °C | 53 mm | -26 mm |
| Mar | 6.6 °C | +3.6 °C | 249 mm | +163 mm |
| Apr | 10.1 °C | +2.7 °C | 115 mm | +44 mm |
| May | 11.5 °C | -1.5 °C | 132 mm | +64 mm |
| Jun | 16.5 °C | +0.2 °C | 133 mm | +43 mm |
| Jul | 24.1 °C | +5.6 °C | 54 mm | -35 mm |
| Aug | 17.8 °C | +0.2 °C | 125 mm | +31 mm |
| Sep | 17.3 °C | +3.8 °C | 74 mm | -33 mm |
| Oct | 9.7 °C | +1.9 °C | 129 mm | +28 mm |
| Nov | 4.2 °C | +2.0 °C | 123 mm | +40 mm |
| Dec | 4.0 °C | +4.6 °C | 84 mm | -12 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Trondheim?
Trondheim has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 4.6 °C and it receives 1,048 mm of precipitation per year.
What is the hottest day ever recorded in Trondheim?
The hottest day measured in Trondheim between 1940 and 2025 was 27 July 2019, reaching 33.4 °C.
What is the coldest day in Trondheim?
The coldest day measured in Trondheim between 1940 and 2025 was 1 January 1979, at -34.8 °C.
Does it snow in Trondheim?
Yes. Trondheim gets on average 194.5 cm of snow per year and has around 144 frost days.
Has the climate of Trondheim warmed?
Yes: Trondheim warmed by +4.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Trondheim?
The wettest day measured in Trondheim between 1940 and 2025 was 27 December 1975, with 50 mm of rain in 24 hours.
What was the windiest day in Trondheim?
The windiest day measured in Trondheim between 1940 and 2025 was 1 January 1992, with winds reaching 50.1 km/h.
What is the warmest month in Trondheim?
The warmest month in Trondheim is July (14.6 °C on average); the coldest is January (-5.0 °C).
How much does it rain in Trondheim?
Trondheim receives on average 1,048 mm of precipitation per year, spread over about 183 rainy days.
Is it sunny in Trondheim?
Trondheim gets on average 6.9 hours of sunshine per day, roughly 2,519 hours per year over 1940-2025.
What is the biggest single-day snowfall in Trondheim?
The heaviest 24-hour snowfall measured in Trondheim between 1940 and 2025 was 4 February 1993, with 20.7 cm.
Are there tropical nights in Trondheim?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Trondheim.
What was the most extreme apparent temperature in Trondheim?
In Trondheim, between 1940 and 2025, the highest apparent temperature reached 34.5 °C on 27 July 2019, and the lowest was -39.6 °C on 1 January 1979.
Compare Trondheim with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Trondheim