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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 61°F, while the coldest is February averaging around 22°F at night. Around 43 inches of precipitation falls each year, peaking in October (5.1 inches) and easing off in May (2.2 inches). 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 (°F) | 30 | 30 | 33 | 39 | 48 | 55 | 61 | 59 | 52 | 41 | 36 | 33 |
| Avg temp (°F) | 26 | 26 | 29 | 34 | 42 | 49 | 55 | 53 | 47 | 38 | 32 | 29 |
| Avg low (°F) | 22 | 22 | 24 | 29 | 36 | 43 | 48 | 47 | 41 | 34 | 29 | 25 |
| Precipitation (in) | 4.3 | 3.7 | 3.9 | 2.7 | 2.2 | 2.3 | 2.9 | 3.5 | 4.4 | 5.1 | 3.7 | 4.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 30 | 30 | 33 | 39 | 48 | 55 |
| Avg temp (°F) | 26 | 26 | 29 | 34 | 42 | 49 |
| Avg low (°F) | 22 | 22 | 24 | 29 | 36 | 43 |
| Precipitation (in) | 4.3 | 3.7 | 3.9 | 2.7 | 2.2 | 2.3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 61 | 59 | 52 | 41 | 36 | 33 |
| Avg temp (°F) | 55 | 53 | 47 | 38 | 32 | 29 |
| Avg low (°F) | 48 | 47 | 41 | 34 | 29 | 25 |
| Precipitation (in) | 2.9 | 3.5 | 4.4 | 5.1 | 3.7 | 4.3 |
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 ≤ 32°F (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 ≤ 32°F (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 ≤ 32°F (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 (mph) | 5.9 | 5.6 | 5.3 | 4.3 | 3.2 | 1.8 | 1.2 | 1.4 | 1.7 | 2.3 | 3.6 | 5.2 |
| 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 (mph) | 5.9 | 5.6 | 5.3 | 4.3 | 3.2 | 1.8 |
| 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 (mph) | 1.2 | 1.4 | 1.7 | 2.3 | 3.6 | 5.2 |
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.