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Coleraine, Northern Ireland climate
Cfb Oceanic / temperate
Coleraine has a mildly seasonal cool-temperate climate (Oceanic / temperate, Köppen Cfb). The hottest month is July with an average daily high near 19°C, while the coldest is January averaging around 2°C at night. Precipitation is fairly even year-round, totalling about 921 mm. At latitude 55°N, day length swings from 7.0 hours in midwinter to 17.0 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)Coleraine climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 7 | 8 | 9 | 12 | 15 | 17 | 19 | 18 | 16 | 13 | 10 | 7 |
| Avg temp (°C) | 5 | 5 | 6 | 8 | 11 | 13 | 15 | 15 | 13 | 10 | 7 | 5 |
| Avg low (°C) | 2 | 2 | 3 | 4 | 7 | 9 | 11 | 11 | 9 | 7 | 4 | 2 |
| Precipitation (mm) | 94 | 64 | 60 | 56 | 63 | 73 | 80 | 89 | 68 | 93 | 93 | 88 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 7 | 8 | 9 | 12 | 15 | 17 |
| Avg temp (°C) | 5 | 5 | 6 | 8 | 11 | 13 |
| Avg low (°C) | 2 | 2 | 3 | 4 | 7 | 9 |
| Precipitation (mm) | 94 | 64 | 60 | 56 | 63 | 73 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 19 | 18 | 16 | 13 | 10 | 7 |
| Avg temp (°C) | 15 | 15 | 13 | 10 | 7 | 5 |
| Avg low (°C) | 11 | 11 | 9 | 7 | 4 | 2 |
| Precipitation (mm) | 80 | 89 | 68 | 93 | 93 | 88 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 79 | 79 | 80 | 78 | 76 | 81 | 81 | 80 | 78 | 77 | 78 | 78 |
| Relative humidity (%) | 91 | 90 | 88 | 86 | 84 | 85 | 86 | 86 | 87 | 88 | 90 | 91 |
| Wind speed (km/h) | 21.5 | 20.9 | 19.1 | 16.7 | 15.4 | 14.2 | 13.7 | 14.5 | 16.7 | 18.9 | 20.0 | 20.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 79 | 79 | 80 | 78 | 76 | 81 |
| Relative humidity (%) | 91 | 90 | 88 | 86 | 84 | 85 |
| Wind speed (km/h) | 21.5 | 20.9 | 19.1 | 16.7 | 15.4 | 14.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 81 | 80 | 78 | 77 | 78 | 78 |
| Relative humidity (%) | 86 | 86 | 87 | 88 | 90 | 91 |
| Wind speed (km/h) | 13.7 | 14.5 | 16.7 | 18.9 | 20.0 | 20.3 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 26 years of daily observations at Portglenone, a weather station, about 33 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.