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Weather & Climate in Harwell, United Kingdom
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Harwell experiences four distinct seasons with an average annual temperature of 51°F (11°C). Winters average 40°F in January while summers reach 60°F in July. The area gets 221 sunny days per year, above the national average. Annual precipitation totals 36.6 inches. The area receives 4.5 inches of snow annually. The city sits at an elevation of 262 feet.
Temperature
40°F Jan (4°C)
60°F Jul (16°C)
| Annual Average | 51.3°F |
| 5% below US avg | |
| January Average | 40°F (4°C) |
| July Average | 60°F (16°C) |
| Sunny Days | 221 days/yr |
Geography
| Elevation | 262 ft (80 m) |
| Area | 3.3 sq mi (8.5 km²) |
| Population Density | 611/sq mi |
| Coordinates | 51.5995°N, 1.2918°W |
| Timezone | Europe/London |
Precipitation & Snow
Air Quality
Earthquake History
41 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 | 118 km | 9 km |
| Apr 2, 1990 | 4 km NNE of Presteigne, United Kingdom | M4.7 | 141 km | 18 km |
| Oct 28, 2001 | 5 km E of Long Clawson, United Kingdom | M4.2 | 142 km | 12 km |
| Sep 23, 2000 | 1 km WSW of Warwick, United Kingdom | M4.0 | 79 km | 13 km |
| Jan 28, 2015 | 2 km WSW of Market Overton, United Kingdom | M3.8 | 131 km | 3 km |
| May 12, 1994 | 4 km S of Shipston on Stour, United Kingdom | M3.7 | 52 km | 10 km |
| Jan 29, 2004 | 2 km E of North Petherton, United Kingdom | M3.7 | 130 km | 7 km |
| Jan 29, 2004 | 2 km E of North Petherton, United Kingdom | M3.6 | 130 km | 7 km |
| Oct 10, 2001 | 2 km SSE of Caerphilly, United Kingdom | M3.5 | 132 km | 10 km |
| Apr 18, 2014 | 3 km WSW of Market Overton, United Kingdom | M3.5 | 131 km | 2 km |
| Feb 12, 2002 | 1 km SSE of Deri, United Kingdom | M3.5 | 136 km | 8 km |
| Feb 24, 2023 | 1 km ENE of Brynmawr, United Kingdom | M3.4 | 131 km | 10 km |
| Jun 20, 2002 | 3 km N of Marshfield, United Kingdom | M3.4 | 124 km | 14 km |
| Feb 17, 1992 | 1 km W of Warboys, United Kingdom | M3.4 | 121 km | 10 km |
| Jan 29, 2004 | 2 km E of North Petherton, United Kingdom | M3.3 | 130 km | 7 km |
| Mar 4, 1990 | 2 km N of Great Haywood, United Kingdom | M3.3 | 145 km | 10 km |
| Sep 9, 1995 | 0 km WNW of East Wittering, United Kingdom | M3.3 | 96 km | 10 km |
| Feb 27, 2019 | 3 km SE of Dorking, United Kingdom | M3.3 | 81 km | 10 km |
| Jul 30, 1999 | 2 km ENE of Bargoed, United Kingdom | M3.3 | 132 km | 6 km |
| Sep 23, 2002 | 3 km ESE of Wombourn, United Kingdom | M3.2 | 118 km | 9 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 40°F (4°C) | 2.6 in | Coldest |
| February | 40°F (4°C) | 1.9 in | |
| March | 43°F (6°C) | 2.2 in | |
| April | 47°F (8°C) | 1.8 in | |
| May | 53°F (12°C) | 2.0 in | |
| June | 58°F (14°C) | 2.2 in | |
| July | 60°F (16°C) | 1.7 in | Driest |
| August | 62°F (17°C) | 2.2 in | Warmest |
| September | 57°F (14°C) | 2.4 in | |
| October | 51°F (11°C) | 2.5 in | |
| November | 45°F (7°C) | 2.6 in | |
| December | 41°F (5°C) | 2.8 in | Wettest |
Harwell has a seasonal temperature swing of 22°F / from 40°F in January to 62°F in August. Total annual precipitation is 26.9 inches, with December being the wettest month (2.8") and July the driest (1.7").