Home › Cities › Isle of Man › Douglas
Douglas, Isle of Man climate
Cfb Oceanic / temperate
Douglas has a mildly seasonal cool-temperate climate (Oceanic / temperate, Köppen Cfb). The hottest month is August with an average daily high near 65°F, while the coldest is February averaging around 39°F at night. Precipitation is fairly even year-round, totalling about 35 inches. At latitude 54°N, day length swings from 7.1 hours in midwinter to 16.9 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)Douglas climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 47 | 47 | 49 | 53 | 58 | 62 | 65 | 65 | 62 | 57 | 52 | 49 |
| Avg temp (°F) | 43 | 43 | 45 | 48 | 52 | 56 | 60 | 60 | 57 | 53 | 48 | 45 |
| Avg low (°F) | 39 | 39 | 40 | 42 | 47 | 51 | 54 | 55 | 52 | 49 | 44 | 40 |
| Precipitation (in) | 3.3 | 2.6 | 2.5 | 2.2 | 2.2 | 2.5 | 2.3 | 2.6 | 2.8 | 4.0 | 4.1 | 3.7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 47 | 47 | 49 | 53 | 58 | 62 |
| Avg temp (°F) | 43 | 43 | 45 | 48 | 52 | 56 |
| Avg low (°F) | 39 | 39 | 40 | 42 | 47 | 51 |
| Precipitation (in) | 3.3 | 2.6 | 2.5 | 2.2 | 2.2 | 2.5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 65 | 65 | 62 | 57 | 52 | 49 |
| Avg temp (°F) | 60 | 60 | 57 | 53 | 48 | 45 |
| Avg low (°F) | 54 | 55 | 52 | 49 | 44 | 40 |
| Precipitation (in) | 2.3 | 2.6 | 2.8 | 4.0 | 4.1 | 3.7 |
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 | 16 | 14 | 13 | 13 | 14 | 15 | 15 | 18 | 20 | 19 |
| Days with low ≤ 32°F (days) | 3 | 3 | 2 | 0.4 | — | — | — | — | — | 0.1 | 0.9 | 3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 18 | 16 | 16 | 14 | 13 | 13 |
| Days with low ≤ 32°F (days) | 3 | 3 | 2 | 0.4 | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 14 | 15 | 15 | 18 | 20 | 19 |
| Days with low ≤ 32°F (days) | — | — | — | 0.1 | 0.9 | 3 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 79 | 79 | 78 | 76 | 73 | 77 | 78 | 77 | 76 | 78 | 79 | 78 |
| Relative humidity (%) | 85 | 85 | 86 | 86 | 85 | 87 | 87 | 86 | 84 | 83 | 84 | 84 |
| Wind speed (mph) | 17.6 | 16.7 | 14.7 | 12.4 | 11.5 | 10.5 | 10.5 | 11.5 | 13.4 | 15.8 | 17.1 | 17.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 79 | 79 | 78 | 76 | 73 | 77 |
| Relative humidity (%) | 85 | 85 | 86 | 86 | 85 | 87 |
| Wind speed (mph) | 17.6 | 16.7 | 14.7 | 12.4 | 11.5 | 10.5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 78 | 77 | 76 | 78 | 79 | 78 |
| Relative humidity (%) | 87 | 86 | 84 | 83 | 84 | 84 |
| Wind speed (mph) | 10.5 | 11.5 | 13.4 | 15.8 | 17.1 | 17.6 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Ronaldsway, a weather station, about 12 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.