Home › Cities › Norway › Tromsø
Tromsø, Norway climate
Dfc Subarctic
Tromsø has a seasonal cold-temperate climate (Subarctic, Köppen Dfc). The hottest month is July with an average daily high near 16°C, while the coldest is February averaging around −6°C at night. Around 1089 mm of precipitation falls each year, peaking in October (129 mm) and easing off in May (56 mm). At latitude 70°N, day length swings from 0.0 hours in midwinter to 24.0 hours at midsummer.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Tromsø climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | −1 | −1 | 1 | 4 | 9 | 13 | 16 | 15 | 11 | 5 | 2 | 0 |
| Avg temp (°C) | −3 | −3 | −2 | 1 | 6 | 10 | 13 | 12 | 8 | 3 | 0 | −2 |
| Avg low (°C) | −5 | −6 | −4 | −2 | 2 | 6 | 9 | 8 | 5 | 1 | −2 | −4 |
| Precipitation (mm) | 109 | 94 | 98 | 70 | 56 | 57 | 74 | 89 | 111 | 129 | 93 | 110 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | −1 | −1 | 1 | 4 | 9 | 13 |
| Avg temp (°C) | −3 | −3 | −2 | 1 | 6 | 10 |
| Avg low (°C) | −5 | −6 | −4 | −2 | 2 | 6 |
| Precipitation (mm) | 109 | 94 | 98 | 70 | 56 | 57 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 16 | 15 | 11 | 5 | 2 | 0 |
| Avg temp (°C) | 13 | 12 | 8 | 3 | 0 | −2 |
| Avg low (°C) | 9 | 8 | 5 | 1 | −2 | −4 |
| Precipitation (mm) | 74 | 89 | 111 | 129 | 93 | 110 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 18 | 16 | 18 | 16 | 15 | 15 | 16 | 17 | 19 | 19 | 17 | 18 |
| Days with low ≤ 0°C (days) | 29 | 26 | 28 | 21 | 8 | 0.2 | — | — | 1 | 14 | 21 | 27 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 18 | 16 | 18 | 16 | 15 | 15 |
| Days with low ≤ 0°C (days) | 29 | 26 | 28 | 21 | 8 | 0.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 16 | 17 | 19 | 19 | 17 | 18 |
| Days with low ≤ 0°C (days) | — | — | 1 | 14 | 21 | 27 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 83 | 81 | 80 | 77 | 76 | 79 | 79 | 79 | 79 | 80 | 81 | 85 |
| Relative humidity (%) | 95 | 95 | 94 | 92 | 86 | 80 | 82 | 85 | 90 | 95 | 96 | 96 |
| Wind speed (m/s) | 2.6 | 2.5 | 2.4 | 1.9 | 1.4 | 0.8 | 0.6 | 0.6 | 0.8 | 1.1 | 1.6 | 2.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 83 | 81 | 80 | 77 | 76 | 79 |
| Relative humidity (%) | 95 | 95 | 94 | 92 | 86 | 80 |
| Wind speed (m/s) | 2.6 | 2.5 | 2.4 | 1.9 | 1.4 | 0.8 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 79 | 79 | 79 | 80 | 81 | 85 |
| Relative humidity (%) | 82 | 85 | 90 | 95 | 96 | 96 |
| Wind speed (m/s) | 0.6 | 0.6 | 0.8 | 1.1 | 1.6 | 2.3 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Tromso, a weather station, about 1 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.