Tromsø climate — normals and trends
Tromsø (Norway) has a subarctic climate (Dfc) under the Köppen-Geiger classification. Its mean annual temperature is 0.7 °C and it receives 1,201 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 (12.2 °C on average) and the coldest is January (-9.2 °C). Rainfall peaks in October.
Tromsø averages 195 frost days, 0 hot days (≥ 30 °C) and 190 rainy days per year.
Tromsø has warmed by +4.7 °C between 1940 and 2025, or +0.56 °C per decade. This trend is statistically significant.
The number of frost days there went from about 228 to 162 per year over the period.
The hottest day of the period reached 30.3 °C (on 1 July 1972) and the coldest -36.3 °C (on 3 February 1966).
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
TromsøTroms
- coords
- 69.65°, 18.96°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
0.7°C
Average daily high
3.2°C
Average daily low
-2.2°C
Annual rainfall
1,201mm
Sunshine / day
6.2h
Mean relative humidity
79%
Average peak wind
12.9km/h
Seasonal range
21.4°C
Frost days (< 0 °C)
195 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
190 d/yr
Annual snowfall
375.3 cm
Average feels-like high
-0.1 °C
Average feels-like low
-5.9 °C
Average peak gust
38.6 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
7.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+4.7 °C
since 1940
+0.6 °C per decade · r² = 0.66 · 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
30.3 °C
1 July 1972
Coldest day
-36.3 °C
3 February 1966
Wettest day
54 mm
27 December 1948
Windiest day
50.7 km/h
1 February 1993
Strongest gust
166.7 km/h
1 February 1993
Hottest feels-like
30.5 °C
20 July 1988
Coldest feels-like
-42.0 °C
3 February 1966
Snowiest day
29.4 cm
7 May 1959
Sunniest day
23.3 h
8 June 1942
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 | -2.5 °C | +4.0 °C | 179 mm | +75 mm |
| Feb | 1.9 °C | +7.9 °C | 147 mm | +55 mm |
| Mar | 0.5 °C | +3.2 °C | 151 mm | +50 mm |
| Apr | 1.5 °C | -0.2 °C | 149 mm | +60 mm |
| May | 8.0 °C | +1.6 °C | 85 mm | -0 mm |
| Jun | 12.1 °C | +0.9 °C | 95 mm | +6 mm |
| Jul | 17.0 °C | +2.0 °C | 59 mm | -32 mm |
| Aug | 15.5 °C | +1.6 °C | 152 mm | +50 mm |
| Sep | 14.2 °C | +4.6 °C | 114 mm | -3 mm |
| Oct | 6.1 °C | +2.9 °C | 126 mm | -7 mm |
| Nov | -0.2 °C | +2.0 °C | 123 mm | +25 mm |
| Dec | -0.5 °C | +4.5 °C | 128 mm | +28 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 Tromsø?
Tromsø has a subarctic climate (Köppen Dfc). Over 1940-2025, the average annual temperature is 0.7 °C and it receives 1,201 mm of precipitation per year.
What is the hottest day ever recorded in Tromsø?
The hottest day measured in Tromsø between 1940 and 2025 was 1 July 1972, reaching 30.3 °C.
What is the coldest day in Tromsø?
The coldest day measured in Tromsø between 1940 and 2025 was 3 February 1966, at -36.3 °C.
Does it snow in Tromsø?
Yes. Tromsø gets on average 375.3 cm of snow per year and has around 195 frost days.
Has the climate of Tromsø warmed?
Yes: Tromsø warmed by +4.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Tromsø?
The wettest day measured in Tromsø between 1940 and 2025 was 27 December 1948, with 54 mm of rain in 24 hours.
What was the windiest day in Tromsø?
The windiest day measured in Tromsø between 1940 and 2025 was 1 February 1993, with winds reaching 50.7 km/h.
What is the warmest month in Tromsø?
The warmest month in Tromsø is July (12.2 °C on average); the coldest is January (-9.2 °C).
How much does it rain in Tromsø?
Tromsø receives on average 1,201 mm of precipitation per year, spread over about 190 rainy days.
Is it sunny in Tromsø?
Tromsø gets on average 6.2 hours of sunshine per day, roughly 2,263 hours per year over 1940-2025.
What is the biggest single-day snowfall in Tromsø?
The heaviest 24-hour snowfall measured in Tromsø between 1940 and 2025 was 7 May 1959, with 29.4 cm.
Are there tropical nights in Tromsø?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Tromsø.
What was the most extreme apparent temperature in Tromsø?
In Tromsø, between 1940 and 2025, the highest apparent temperature reached 30.5 °C on 20 July 1988, and the lowest was -42.0 °C on 3 February 1966.
Compare Tromsø with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Tromsø