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Llanelli, Wales climate
Cfb Oceanic / temperate
Llanelli 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 1058 mm. At latitude 52°N, day length swings from 7.6 hours in midwinter to 16.4 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)Llanelli climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 8 | 9 | 10 | 13 | 16 | 18 | 20 | 20 | 18 | 15 | 11 | 9 |
| Avg temp (°C) | 6 | 6 | 7 | 9 | 12 | 14 | 16 | 16 | 14 | 11 | 8 | 6 |
| Avg low (°C) | 3 | 3 | 3 | 5 | 7 | 10 | 12 | 12 | 10 | 8 | 5 | 3 |
| Precipitation (mm) | 109 | 79 | 65 | 75 | 70 | 71 | 67 | 93 | 74 | 115 | 120 | 120 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 8 | 9 | 10 | 13 | 16 | 18 |
| Avg temp (°C) | 6 | 6 | 7 | 9 | 12 | 14 |
| Avg low (°C) | 3 | 3 | 3 | 5 | 7 | 10 |
| Precipitation (mm) | 109 | 79 | 65 | 75 | 70 | 71 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 20 | 20 | 18 | 15 | 11 | 9 |
| Avg temp (°C) | 16 | 16 | 14 | 11 | 8 | 6 |
| Avg low (°C) | 12 | 12 | 10 | 8 | 5 | 3 |
| Precipitation (mm) | 67 | 93 | 74 | 115 | 120 | 120 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 78 | 76 | 74 | 69 | 68 | 68 | 71 | 71 | 70 | 76 | 79 | 78 |
| Relative humidity (%) | 88 | 88 | 87 | 85 | 84 | 85 | 85 | 85 | 84 | 85 | 86 | 87 |
| Wind speed (m/s) | 6.2 | 5.9 | 5.3 | 4.6 | 4.3 | 4.1 | 4.1 | 4.4 | 4.9 | 5.7 | 6.0 | 6.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 78 | 76 | 74 | 69 | 68 | 68 |
| Relative humidity (%) | 88 | 88 | 87 | 85 | 84 | 85 |
| Wind speed (m/s) | 6.2 | 5.9 | 5.3 | 4.6 | 4.3 | 4.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 71 | 71 | 70 | 76 | 79 | 78 |
| Relative humidity (%) | 85 | 85 | 84 | 85 | 86 | 87 |
| Wind speed (m/s) | 4.1 | 4.4 | 4.9 | 5.7 | 6.0 | 6.3 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 28 years of daily observations at Pembry Sands, a weather station, about 15 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.