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Sisimiut, Greenland climate
ET Tundra
Sisimiut has a seasonal subarctic climate (Tundra, Köppen ET). The hottest month is July with an average daily high near 57°F, while the coldest is February averaging around 6°F at night. Around 20 inches of precipitation falls each year, peaking in October (2.5 inches) and easing off in June (0.7 inches). At latitude 67°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)Sisimiut climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 20 | 18 | 21 | 30 | 43 | 52 | 57 | 55 | 46 | 37 | 29 | 24 |
| Avg temp (°F) | 15 | 12 | 14 | 24 | 36 | 45 | 49 | 48 | 41 | 32 | 24 | 19 |
| Avg low (°F) | 9 | 6 | 8 | 17 | 30 | 37 | 41 | 42 | 36 | 28 | 19 | 14 |
| Precipitation (in) | 1.3 | 1.0 | 1.2 | 1.1 | 1.0 | 0.7 | 1.9 | 2.5 | 2.1 | 2.5 | 2.3 | 2.0 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 20 | 18 | 21 | 30 | 43 | 52 |
| Avg temp (°F) | 15 | 12 | 14 | 24 | 36 | 45 |
| Avg low (°F) | 9 | 6 | 8 | 17 | 30 | 37 |
| Precipitation (in) | 1.3 | 1.0 | 1.2 | 1.1 | 1.0 | 0.7 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 57 | 55 | 46 | 37 | 29 | 24 |
| Avg temp (°F) | 49 | 48 | 41 | 32 | 24 | 19 |
| Avg low (°F) | 41 | 42 | 36 | 28 | 19 | 14 |
| Precipitation (in) | 1.9 | 2.5 | 2.1 | 2.5 | 2.3 | 2.0 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 10 | 9 | 9 | 7 | 6 | 7 | 7 | 8 | 10 | 10 | 10 | 11 |
| Days with low ≤ 32°F (days) | 26 | 24 | 27 | 26 | 18 | 3 | 0.1 | — | 5 | 21 | 26 | 27 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 10 | 9 | 9 | 7 | 6 | 7 |
| Days with low ≤ 32°F (days) | 26 | 24 | 27 | 26 | 18 | 3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 7 | 8 | 10 | 10 | 10 | 11 |
| Days with low ≤ 32°F (days) | 0.1 | — | 5 | 21 | 26 | 27 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 78 | 76 | 73 | 70 | 72 | 71 | 68 | 70 | 72 | 71 | 77 | 77 |
| Relative humidity (%) | 94 | 95 | 93 | 89 | 86 | 87 | 87 | 87 | 85 | 86 | 88 | 91 |
| Wind speed (mph) | 8.7 | 7.6 | 7.9 | 8.0 | 6.9 | 6.2 | 5.5 | 6.1 | 7.3 | 7.9 | 8.7 | 9.0 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 78 | 76 | 73 | 70 | 72 | 71 |
| Relative humidity (%) | 94 | 95 | 93 | 89 | 86 | 87 |
| Wind speed (mph) | 8.7 | 7.6 | 7.9 | 8.0 | 6.9 | 6.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 68 | 70 | 72 | 71 | 77 | 77 |
| Relative humidity (%) | 87 | 87 | 85 | 86 | 88 | 91 |
| Wind speed (mph) | 5.5 | 6.1 | 7.3 | 7.9 | 8.7 | 9.0 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 19 years of daily observations at Mitt. Sisimiut, a weather station, about 2 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.