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Weather & Climate in Hartley, United Kingdom
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Hartley experiences four distinct seasons with an average annual temperature of 53°F (12°C). Winters average 42°F in January while summers reach 64°F in July. The area gets 238 sunny days per year, above the national average. Annual precipitation totals 31.0 inches. The area receives 3.4 inches of snow annually. The city sits at an elevation of 331 feet.
Temperature
42°F Jan (5°C)
64°F Jul (18°C)
| Annual Average | 53.1°F |
| 2% below US avg | |
| January Average | 42°F (5°C) |
| July Average | 64°F (18°C) |
| Sunny Days | 238 days/yr |
Geography
| Elevation | 331 ft (101 m) |
| Area | 173.3 sq mi (448.8 km²) |
| Population Density | 94/sq mi |
| Coordinates | 51.3867°N, 0.3037°W |
| Timezone | Europe/London |
Precipitation & Snow
Air Quality
Earthquake History
33 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.6.
| Oct 6, 1999 | 34 km NNW of Fécamp, France | M4.6 | 148 km | 1 km |
| Apr 28, 2007 | 1 km WNW of Lympne, United Kingdom | M4.6 | 60 km | 10 km |
| Feb 15, 1994 | 7 km ESE of Thetford, United Kingdom | M4.4 | 116 km | 10 km |
| Jan 23, 2007 | 57 km ENE of Broadstairs, United Kingdom | M4.1 | 130 km | 10 km |
| Dec 14, 1991 | 3 km SSE of Longfossé, France | M4.0 | 136 km | 10 km |
| Sep 15, 1994 | 38 km NE of Broadstairs, United Kingdom | M3.9 | 106 km | 10 km |
| Jan 27, 1998 | 27 km W of Le Touquet-Paris-Plage, France | M3.8 | 117 km | 2 km |
| May 22, 2015 | 3 km SSE of Ramsgate, United Kingdom | M3.7 | 79 km | 12 km |
| Mar 3, 2009 | 1 km ENE of Hawkinge, United Kingdom | M3.5 | 68 km | 4 km |
| Jan 27, 1992 | 6 km SSE of Longfossé, France | M3.5 | 139 km | 10 km |
| Feb 17, 1992 | 1 km W of Warboys, United Kingdom | M3.4 | 116 km | 10 km |
| Sep 9, 1995 | 0 km WNW of East Wittering, United Kingdom | M3.3 | 107 km | 10 km |
| Feb 27, 2019 | 3 km SE of Dorking, United Kingdom | M3.3 | 46 km | 10 km |
| Feb 13, 1997 | 26 km W of Le Touquet-Paris-Plage, France | M3.2 | 116 km | 5 km |
| May 4, 1990 | 0 km NE of Coquelles, France | M3.1 | 116 km | 10 km |
| May 1, 1997 | 21 km W of Fort-Mahon-Plage, France | M3.0 | 135 km | 5 km |
| Nov 5, 1994 | 5 km N of Debenham, United Kingdom | M3.0 | 116 km | 5 km |
| Nov 25, 1998 | 26 km N of Grand-Fort-Philippe, France | M3.0 | 125 km | 10 km |
| Feb 15, 1994 | 4 km NNE of Banham, United Kingdom | M2.9 | 133 km | 10 km |
| Jul 16, 2005 | 3 km WSW of Southwater, United Kingdom | M2.9 | 64 km | 5 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 | — | 99 km |
| 1911 | FOLKSTONE, ENGLAND | Meteorological | 0.9 m | — | 73 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 42°F (5°C) | 2.7 in | Wettest |
| February | 40°F (4°C) | 1.7 in | Coldest, Driest |
| March | 43°F (6°C) | 1.9 in | |
| April | 47°F (8°C) | 1.7 in | |
| May | 53°F (12°C) | 1.8 in | |
| June | 59°F (15°C) | 2.1 in | |
| July | 64°F (18°C) | 1.7 in | Warmest |
| August | 63°F (17°C) | 1.9 in | |
| September | 58°F (14°C) | 2.3 in | |
| October | 51°F (11°C) | 2.5 in | |
| November | 45°F (7°C) | 2.6 in | |
| December | 41°F (5°C) | 2.5 in |
Hartley has a seasonal temperature swing of 24°F / from 40°F in February to 64°F in July. Total annual precipitation is 25.4 inches, with January being the wettest month (2.7") and February the driest (1.7").