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Weather & Climate in Harrow on the Hill, United Kingdom
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Harrow on the Hill experiences four distinct seasons with an average annual temperature of 53°F (12°C). Winters average 41°F in January while summers reach 63°F in July. The area gets 223 sunny days per year, above the national average. Annual precipitation totals 33.6 inches. The area receives 2.7 inches of snow annually. The city sits at an elevation of 236 feet.
Temperature
41°F Jan (5°C)
63°F Jul (17°C)
| Annual Average | 53.0°F |
| 2% below US avg | |
| January Average | 41°F (5°C) |
| July Average | 63°F (17°C) |
| Sunny Days | 223 days/yr |
Geography
| Elevation | 236 ft (72 m) |
| Area | 23.1 sq mi (59.9 km²) |
| Population Density | 460/sq mi |
| Coordinates | 51.5714°N, 0.3337°W |
| Timezone | Europe/London |
Precipitation & Snow
Air Quality
Earthquake History
29 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.6.
| Apr 28, 2007 | 1 km WNW of Lympne, United Kingdom | M4.6 | 108 km | 10 km |
| Feb 15, 1994 | 7 km ESE of Thetford, United Kingdom | M4.4 | 121 km | 10 km |
| Oct 28, 2001 | 5 km E of Long Clawson, United Kingdom | M4.2 | 146 km | 12 km |
| Sep 23, 2000 | 1 km WSW of Warwick, United Kingdom | M4.0 | 118 km | 13 km |
| Sep 15, 1994 | 38 km NE of Broadstairs, United Kingdom | M3.9 | 147 km | 10 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 | 102 km | 10 km |
| May 22, 2015 | 3 km SSE of Ramsgate, United Kingdom | M3.7 | 126 km | 12 km |
| Apr 18, 2014 | 3 km WSW of Market Overton, United Kingdom | M3.5 | 131 km | 2 km |
| Mar 3, 2009 | 1 km ENE of Hawkinge, United Kingdom | M3.5 | 117 km | 4 km |
| Feb 17, 1992 | 1 km W of Warboys, United Kingdom | M3.4 | 94 km | 10 km |
| Sep 9, 1995 | 0 km WNW of East Wittering, United Kingdom | M3.3 | 97 km | 10 km |
| Feb 27, 2019 | 3 km SE of Dorking, United Kingdom | M3.3 | 40 km | 10 km |
| Nov 5, 1994 | 5 km N of Debenham, United Kingdom | M3.0 | 130 km | 5 km |
| Jul 16, 2005 | 3 km WSW of Southwater, United Kingdom | M2.9 | 63 km | 5 km |
| Jan 27, 2015 | 1 km ENE of Winchester, United Kingdom | M2.9 | 87 km | 3 km |
| Mar 18, 2001 | 8 km W of Marlborough, United Kingdom | M2.9 | 106 km | 10 km |
| Feb 15, 1994 | 4 km NNE of Banham, United Kingdom | M2.9 | 140 km | 10 km |
| Sep 22, 2015 | 2 km W of Cottesmore, United Kingdom | M2.8 | 129 km | 2 km |
| Mar 23, 1992 | 22 km SSE of Folkestone, United Kingdom | M2.7 | 136 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tsunami History
2 tsunamis recorded within 500 km. Highest wave on record: 6.0 m (20 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1858 | NORTH SEA | Unknown | 6.0 m | — | 148 km |
| 1911 | FOLKSTONE, ENGLAND | Meteorological | 0.9 m | — | 121 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 41°F (5°C) | 2.4 in | |
| February | 41°F (5°C) | 1.6 in | Coldest, Driest |
| March | 44°F (7°C) | 1.9 in | |
| April | 48°F (9°C) | 1.8 in | |
| May | 54°F (12°C) | 2.0 in | |
| June | 60°F (15°C) | 2.1 in | |
| July | 63°F (17°C) | 1.6 in | |
| August | 63°F (17°C) | 2.0 in | Warmest |
| September | 58°F (15°C) | 2.2 in | |
| October | 52°F (11°C) | 2.5 in | Wettest |
| November | 45°F (7°C) | 2.3 in | |
| December | 42°F (6°C) | 2.4 in |
Harrow on the Hill has a seasonal temperature swing of 23°F / from 41°F in February to 63°F in August. Total annual precipitation is 24.8 inches, with October being the wettest month (2.5") and February the driest (1.6").