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Colwyn Bay, Wales climate
Cfb Oceanic / temperate
Colwyn Bay has a mildly seasonal cool-temperate climate (Oceanic / temperate, Köppen Cfb). The hottest month is July with an average daily high near 20°C, while the coldest is January averaging around 3°C at night. Precipitation is fairly even year-round, totalling about 758 mm. At latitude 53°N, day length swings from 7.3 hours in midwinter to 16.7 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)Colwyn Bay climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 8 | 8 | 10 | 12 | 15 | 18 | 20 | 19 | 17 | 14 | 11 | 8 |
| Avg temp (°C) | 5 | 6 | 7 | 9 | 11 | 14 | 16 | 16 | 14 | 11 | 8 | 6 |
| Avg low (°C) | 3 | 3 | 4 | 5 | 8 | 10 | 12 | 12 | 10 | 8 | 5 | 3 |
| Precipitation (mm) | 70 | 55 | 47 | 46 | 48 | 53 | 55 | 63 | 64 | 84 | 84 | 90 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 8 | 8 | 10 | 12 | 15 | 18 |
| Avg temp (°C) | 5 | 6 | 7 | 9 | 11 | 14 |
| Avg low (°C) | 3 | 3 | 4 | 5 | 8 | 10 |
| Precipitation (mm) | 70 | 55 | 47 | 46 | 48 | 53 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 20 | 19 | 17 | 14 | 11 | 8 |
| Avg temp (°C) | 16 | 16 | 14 | 11 | 8 | 6 |
| Avg low (°C) | 12 | 12 | 10 | 8 | 5 | 3 |
| Precipitation (mm) | 55 | 63 | 64 | 84 | 84 | 90 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 79 | 79 | 78 | 76 | 73 | 76 | 75 | 76 | 75 | 78 | 80 | 79 |
| Relative humidity (%) | 88 | 87 | 87 | 85 | 84 | 85 | 85 | 85 | 84 | 85 | 86 | 87 |
| Wind speed (km/h) | 23.1 | 22.1 | 19.5 | 16.7 | 16.0 | 15.1 | 15.2 | 16.2 | 18.0 | 20.7 | 22.1 | 22.9 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 79 | 79 | 78 | 76 | 73 | 76 |
| Relative humidity (%) | 88 | 87 | 87 | 85 | 84 | 85 |
| Wind speed (km/h) | 23.1 | 22.1 | 19.5 | 16.7 | 16.0 | 15.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 75 | 76 | 75 | 78 | 80 | 79 |
| Relative humidity (%) | 85 | 85 | 84 | 85 | 86 | 87 |
| Wind speed (km/h) | 15.2 | 16.2 | 18.0 | 20.7 | 22.1 | 22.9 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Rhyl No2, a weather station, about 16 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.