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Weather & Climate in Harpenden, United Kingdom
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Harpenden experiences four distinct seasons with an average annual temperature of 52°F (11°C). Winters average 40°F in January while summers reach 62°F in July. The area gets 223 sunny days per year, above the national average. Annual precipitation totals 32.0 inches. The area receives 4.6 inches of snow annually. The city sits at an elevation of 351 feet.
Temperature
40°F Jan (5°C)
62°F Jul (17°C)
| Annual Average | 51.8°F |
| 4% below US avg | |
| January Average | 40°F (5°C) |
| July Average | 62°F (17°C) |
| Sunny Days | 223 days/yr |
Geography
| Elevation | 351 ft (107 m) |
| Area | 1.9 sq mi (4.9 km²) |
| Population Density | 15,916/sq mi |
| Coordinates | 51.8168°N, 0.3571°W |
| Timezone | Europe/London |
Precipitation & Snow
Air Quality
Earthquake History
34 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 | 145 km | 9 km |
| Apr 28, 2007 | 1 km WNW of Lympne, United Kingdom | M4.6 | 125 km | 10 km |
| Feb 15, 1994 | 7 km ESE of Thetford, United Kingdom | M4.4 | 103 km | 10 km |
| Oct 28, 2001 | 5 km E of Long Clawson, United Kingdom | M4.2 | 119 km | 12 km |
| Sep 23, 2000 | 1 km WSW of Warwick, United Kingdom | M4.0 | 100 km | 13 km |
| Sep 15, 1994 | 38 km NE of Broadstairs, United Kingdom | M3.9 | 149 km | 10 km |
| Jan 28, 2015 | 2 km WSW of Market Overton, United Kingdom | M3.8 | 104 km | 3 km |
| May 22, 2015 | 3 km SSE of Ramsgate, United Kingdom | M3.7 | 137 km | 12 km |
| May 12, 1994 | 4 km S of Shipston on Stour, United Kingdom | M3.7 | 90 km | 10 km |
| Mar 3, 2009 | 1 km ENE of Hawkinge, United Kingdom | M3.5 | 132 km | 4 km |
| Apr 18, 2014 | 3 km WSW of Market Overton, United Kingdom | M3.5 | 104 km | 2 km |
| Feb 17, 1992 | 1 km W of Warboys, United Kingdom | M3.4 | 68 km | 10 km |
| Feb 27, 2019 | 3 km SE of Dorking, United Kingdom | M3.3 | 68 km | 10 km |
| Jan 21, 1999 | 4 km ENE of Old Leake, United Kingdom | M3.3 | 141 km | 10 km |
| Sep 9, 1995 | 0 km WNW of East Wittering, United Kingdom | M3.3 | 122 km | 10 km |
| Feb 21, 2022 | 5 km N of Hockley, United Kingdom | M3.2 | 134 km | 10 km |
| Sep 23, 2002 | 3 km ESE of Wombourn, United Kingdom | M3.2 | 144 km | 9 km |
| Jun 17, 1999 | 7 km NNE of Ross on Wye, United Kingdom | M3.0 | 149 km | 10 km |
| Nov 5, 1994 | 5 km N of Debenham, United Kingdom | M3.0 | 117 km | 5 km |
| Jan 18, 2013 | 0 km NE of Hathern, United Kingdom | M2.9 | 125 km | 13 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tsunami History
1 tsunami recorded within 500 km. Highest wave on record: 0.9 m (3 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1911 | FOLKSTONE, ENGLAND | Meteorological | 0.9 m | — | 136 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 40°F (5°C) | 2.6 in | |
| February | 39°F (4°C) | 1.9 in | Coldest |
| March | 43°F (6°C) | 2.1 in | |
| April | 47°F (8°C) | 2.0 in | |
| May | 53°F (12°C) | 2.1 in | |
| June | 58°F (15°C) | 2.2 in | |
| July | 62°F (17°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 (10°C) | 2.7 in | Wettest |
| November | 44°F (7°C) | 2.6 in | |
| December | 41°F (5°C) | 2.7 in |
Harpenden has a seasonal temperature swing of 23°F / from 39°F in February to 62°F in August. Total annual precipitation is 27.0 inches, with October being the wettest month (2.7") and July the driest (1.7").