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Weather & Climate in Merton, United Kingdom
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Merton experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 42°F in January while summers reach 61°F in July / relatively mild seasonal variation. The area gets 257 sunny days per year, above the national average. Annual precipitation totals 43.4 inches. The city sits at an elevation of 190 feet.
Temperature
42°F Jan (5°C)
61°F Jul (16°C)
| Annual Average | 50.0°F |
| 7% below US avg | |
| January Average | 42°F (5°C) |
| July Average | 61°F (16°C) |
| Sunny Days | 257 days/yr |
Geography
| Elevation | 190 ft (58 m) |
| Area | 869.2 sq mi (2,251.3 km²) |
| Population Density | 1/sq mi |
| Coordinates | 50.8833°N, 4.1000°W |
| Timezone | Europe/London |
Precipitation & Snow
Air Quality
Earthquake History
30 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.5.
| Oct 25, 1999 | 10 km N of Hirwaun, United Kingdom | M4.5 | 113 km | 10 km |
| Feb 17, 2018 | 5 km NE of Clydach, United Kingdom | M4.3 | 95 km | 12 km |
| Feb 20, 2014 | 17 km NNW of Ilfracombe, United Kingdom | M4.1 | 54 km | 3 km |
| May 31, 2001 | 20 km NNW of Flexbury, United Kingdom | M4.0 | 43 km | 29 km |
| Jan 29, 2004 | 2 km E of North Petherton, United Kingdom | M3.7 | 82 km | 7 km |
| Jan 1, 1994 | Wales-England region, United Kingdom | M3.6 | 66 km | 10 km |
| Jan 29, 2004 | 2 km E of North Petherton, United Kingdom | M3.6 | 82 km | 7 km |
| Aug 17, 1995 | 28 km S of Salcombe, United Kingdom | M3.6 | 102 km | 10 km |
| Oct 10, 2001 | 2 km SSE of Caerphilly, United Kingdom | M3.5 | 97 km | 10 km |
| Feb 12, 2002 | 1 km SSE of Deri, United Kingdom | M3.5 | 108 km | 8 km |
| Feb 24, 2023 | 1 km ENE of Brynmawr, United Kingdom | M3.4 | 122 km | 10 km |
| Jun 20, 2002 | 3 km N of Marshfield, United Kingdom | M3.4 | 104 km | 14 km |
| Jul 30, 1999 | 2 km ENE of Bargoed, United Kingdom | M3.3 | 109 km | 6 km |
| Sep 23, 1992 | 1 km NNE of Tiverton, United Kingdom | M3.3 | 44 km | 10 km |
| Jan 29, 2004 | 2 km E of North Petherton, United Kingdom | M3.3 | 82 km | 7 km |
| Oct 16, 1997 | 4 km ENE of Torquay, United Kingdom | M3.2 | 63 km | 10 km |
| Jan 28, 2002 | 1 km S of Abercarn, United Kingdom | M3.0 | 107 km | 10 km |
| Aug 17, 1992 | 1 km E of Machen, United Kingdom | M2.9 | 105 km | 10 km |
| Mar 23, 1998 | 11 km W of Chickerell, United Kingdom | M2.9 | 106 km | 5 km |
| Sep 5, 1999 | 15 km WSW of Salcombe, United Kingdom | M2.9 | 79 km | 5 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 | — | 88 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 42°F (5°C) | 4.9 in | |
| February | 41°F (5°C) | 3.5 in | Coldest |
| March | 44°F (7°C) | 3.3 in | |
| April | 46°F (8°C) | 2.7 in | |
| May | 52°F (11°C) | 2.5 in | Driest |
| June | 57°F (14°C) | 2.7 in | |
| July | 61°F (16°C) | 2.7 in | Warmest |
| August | 60°F (16°C) | 3.2 in | |
| September | 57°F (14°C) | 3.7 in | |
| October | 52°F (11°C) | 4.5 in | |
| November | 46°F (8°C) | 5.0 in | |
| December | 43°F (6°C) | 5.0 in | Wettest |
Merton has a seasonal temperature swing of 20°F / from 41°F in February to 61°F in July. Total annual precipitation is 43.4 inches, with December being the wettest month (5.0") and May the driest (2.5").