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Weather & Climate in Llanellen, United Kingdom
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Llanellen experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 40°F in January while summers reach 59°F in July / relatively mild seasonal variation. The area gets 207 sunny days per year. Annual precipitation totals 43.9 inches. The area receives 7.5 inches of snow annually. The city sits at an elevation of 171 feet.
Temperature
40°F Jan (4°C)
59°F Jul (15°C)
| Annual Average | 50.1°F |
| 7% below US avg | |
| January Average | 40°F (4°C) |
| July Average | 59°F (15°C) |
| Sunny Days | 207 days/yr |
Geography
| Elevation | 171 ft (52 m) |
| Area | 4.0 sq mi (10.3 km²) |
| Population Density | 127/sq mi |
| Coordinates | 51.7930°N, 3.0123°W |
| Timezone | Europe/London |
Precipitation & Snow
Air Quality
Earthquake History
45 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.8.
| Sep 22, 2002 | 2 km ESE of Wombourn, United Kingdom | M4.8 | 100 km | 9 km |
| Apr 2, 1990 | 4 km NNE of Presteigne, United Kingdom | M4.7 | 58 km | 18 km |
| Oct 25, 1999 | 10 km N of Hirwaun, United Kingdom | M4.5 | 37 km | 10 km |
| Feb 17, 2018 | 5 km NE of Clydach, United Kingdom | M4.3 | 59 km | 12 km |
| Feb 20, 2014 | 17 km NNW of Ilfracombe, United Kingdom | M4.1 | 93 km | 3 km |
| May 31, 2001 | 20 km NNW of Flexbury, United Kingdom | M4.0 | 146 km | 29 km |
| Sep 23, 2000 | 1 km WSW of Warwick, United Kingdom | M4.0 | 110 km | 13 km |
| Mar 7, 1996 | 3 km SW of Clive, United Kingdom | M3.8 | 112 km | 10 km |
| May 12, 1994 | 4 km S of Shipston on Stour, United Kingdom | M3.7 | 98 km | 10 km |
| Jan 29, 2004 | 2 km E of North Petherton, United Kingdom | M3.7 | 78 km | 7 km |
| Jan 1, 1994 | Wales-England region, United Kingdom | M3.6 | 63 km | 10 km |
| May 30, 2022 | 2 km ESE of Prees, United Kingdom | M3.6 | 124 km | 10 km |
| Jan 29, 2004 | 2 km E of North Petherton, United Kingdom | M3.6 | 78 km | 7 km |
| Mar 17, 1994 | 5 km WNW of Newtown, United Kingdom | M3.5 | 86 km | 10 km |
| Feb 12, 2002 | 1 km SSE of Deri, United Kingdom | M3.5 | 20 km | 8 km |
| Oct 10, 2001 | 2 km SSE of Caerphilly, United Kingdom | M3.5 | 30 km | 10 km |
| Feb 24, 2023 | 1 km ENE of Brynmawr, United Kingdom | M3.4 | 10 km | 10 km |
| Jun 20, 2002 | 3 km N of Marshfield, United Kingdom | M3.4 | 26 km | 14 km |
| Sep 23, 1992 | 1 km NNE of Tiverton, United Kingdom | M3.3 | 103 km | 10 km |
| Jul 30, 1999 | 2 km ENE of Bargoed, United Kingdom | M3.3 | 17 km | 6 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tsunami History
1 tsunami recorded within 500 km. Highest wave on record: 0.4 m (1 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 2011 | PLYMOUTH, ENGLAND | Avalanche | 0.4 m | — | 144 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 40°F (4°C) | 5.5 in | |
| February | 38°F (3°C) | 3.9 in | Coldest |
| March | 41°F (5°C) | 4.2 in | |
| April | 44°F (7°C) | 3.1 in | |
| May | 51°F (10°C) | 3.1 in | |
| June | 56°F (13°C) | 3.0 in | |
| July | 59°F (15°C) | 2.6 in | Driest |
| August | 59°F (15°C) | 3.7 in | Warmest |
| September | 55°F (13°C) | 4.2 in | |
| October | 49°F (10°C) | 4.7 in | |
| November | 43°F (6°C) | 5.2 in | |
| December | 40°F (5°C) | 5.6 in | Wettest |
Llanellen has a seasonal temperature swing of 21°F / from 38°F in February to 59°F in August. Total annual precipitation is 48.7 inches, with December being the wettest month (5.6") and July the driest (2.6").