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Ilulissat, Greenland climate
ET Tundra
Ilulissat has a seasonal subarctic climate (Tundra, Köppen ET). The hottest month is July with an average daily high near 50°F, while the coldest is February averaging around −1°F at night. Around 13 inches of precipitation falls each year, peaking in August (2.2 inches) and easing off in May (0.6 inches). At latitude 69°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)Ilulissat climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 17 | 11 | 12 | 24 | 35 | 45 | 50 | 48 | 41 | 33 | 27 | 23 |
| Avg temp (°F) | 11 | 4 | 6 | 18 | 31 | 40 | 45 | 44 | 38 | 30 | 22 | 18 |
| Avg low (°F) | 5 | −1 | 0 | 12 | 26 | 35 | 40 | 39 | 34 | 26 | 18 | 13 |
| Precipitation (in) | 1.5 | 0.7 | 0.8 | 0.9 | 0.6 | 0.6 | 0.7 | 2.2 | 1.0 | 1.4 | 1.5 | 1.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 17 | 11 | 12 | 24 | 35 | 45 |
| Avg temp (°F) | 11 | 4 | 6 | 18 | 31 | 40 |
| Avg low (°F) | 5 | −1 | 0 | 12 | 26 | 35 |
| Precipitation (in) | 1.5 | 0.7 | 0.8 | 0.9 | 0.6 | 0.6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 50 | 48 | 41 | 33 | 27 | 23 |
| Avg temp (°F) | 45 | 44 | 38 | 30 | 22 | 18 |
| Avg low (°F) | 40 | 39 | 34 | 26 | 18 | 13 |
| Precipitation (in) | 0.7 | 2.2 | 1.0 | 1.4 | 1.5 | 1.6 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 11 | 8 | 8 | 7 | 6 | 5 | 4 | 6 | 7 | 9 | 11 | 13 |
| Days with low ≤ 32°F (days) | 23 | 20 | 23 | 23 | 22 | 8 | 2 | 1 | 7 | 21 | 24 | 24 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 11 | 8 | 8 | 7 | 6 | 5 |
| Days with low ≤ 32°F (days) | 23 | 20 | 23 | 23 | 22 | 8 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 4 | 6 | 7 | 9 | 11 | 13 |
| Days with low ≤ 32°F (days) | 2 | 1 | 7 | 21 | 24 | 24 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 85 | 83 | 80 | 77 | 75 | 72 | 70 | 74 | 73 | 78 | 84 | 85 |
| Relative humidity (%) | 91 | 93 | 91 | 86 | 83 | 83 | 83 | 85 | 82 | 82 | 85 | 87 |
| Wind speed (mph) | 8.5 | 7.2 | 7.2 | 7.0 | 6.4 | 5.7 | 5.0 | 5.4 | 7.0 | 8.0 | 9.0 | 9.4 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 85 | 83 | 80 | 77 | 75 | 72 |
| Relative humidity (%) | 91 | 93 | 91 | 86 | 83 | 83 |
| Wind speed (mph) | 8.5 | 7.2 | 7.2 | 7.0 | 6.4 | 5.7 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 70 | 74 | 73 | 78 | 84 | 85 |
| Relative humidity (%) | 83 | 85 | 82 | 82 | 85 | 87 |
| Wind speed (mph) | 5.0 | 5.4 | 7.0 | 8.0 | 9.0 | 9.4 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 27 years of daily observations at Aasiaat (egedesminde), a weather station, about 91 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.