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Weather & Climate in Castel, Guernsey
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Castel experiences four distinct seasons with an average annual temperature of 52°F (11°C). Winters average 49°F in January while summers reach 62°F in July / relatively mild seasonal variation. The area gets 241 sunny days per year, above the national average. Annual precipitation totals 42.9 inches. The city sits at an elevation of 16 feet.
Temperature
49°F Jan (9°C)
62°F Jul (16°C)
| Annual Average | 52.2°F |
| 3% below US avg | |
| January Average | 49°F (9°C) |
| July Average | 62°F (16°C) |
| Sunny Days | 241 days/yr |
Geography
| Elevation | 16 ft (5 m) |
| Area | 2.5 sq mi (6.5 km²) |
| Population Density | 0/sq mi |
| Coordinates | 49.4676°N, 2.6002°W |
| Timezone | Europe/Guernsey |
Precipitation & Snow
Air Quality
Earthquake History
76 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.2.
| Apr 30, 1990 | 5 km SE of Saint Helier, Jersey | M4.2 | 53 km | 22 km |
| Jul 11, 2014 | 23 km W of Saint Helier, Jersey | M3.9 | 38 km | 12 km |
| Jul 11, 2002 | 3 km NW of Pluduno, France | M3.8 | 104 km | 10 km |
| Feb 25, 2015 | 30 km SW of Saint Helier, Jersey | M3.7 | 54 km | 2 km |
| Aug 17, 1995 | 28 km S of Salcombe, United Kingdom | M3.6 | 103 km | 10 km |
| Jul 26, 1993 | 5 km ESE of Villedieu-les-Poêles, France | M3.5 | 128 km | 31 km |
| Apr 22, 1995 | 6 km E of Binic, France | M3.5 | 96 km | 10 km |
| Jun 22, 1997 | 13 km SSE of Saint Helier, Jersey | M3.4 | 60 km | 10 km |
| Sep 17, 1994 | 33 km NE of Plouézec, France | M3.4 | 61 km | 10 km |
| Dec 7, 1998 | 0 km SE of Cherrueix, France | M3.4 | 117 km | 2 km |
| Jul 23, 2014 | France | M3.3 | 57 km | 2 km |
| Sep 22, 1991 | 5 km ENE of Neulliac, France | M3.3 | 149 km | 10 km |
| Aug 29, 2001 | 5 km ENE of Saint-Lô, France | M3.3 | 120 km | 6 km |
| Jul 14, 1998 | 7 km NNE of Poullaouen, France | M3.2 | 139 km | 2 km |
| Feb 12, 1990 | 1 km N of Lanmeur, France | M3.2 | 121 km | 10 km |
| Oct 16, 1997 | 4 km ENE of Torquay, United Kingdom | M3.2 | 129 km | 10 km |
| May 30, 2001 | 3 km SW of Quintin, France | M3.2 | 123 km | 8 km |
| Apr 28, 1998 | 3 km NE of Plouha, France | M3.1 | 88 km | 2 km |
| Apr 17, 1992 | 3 km SSE of Plounévez-Quintin, France | M3.1 | 141 km | 10 km |
| Jul 13, 2006 | 12 km N of Plounéour-Trez, France | M3.1 | 148 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: 0.4 m (1 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 2011 | PLYMOUTH, ENGLAND | Avalanche | 0.4 m | — | 118 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 49°F (9°C) | 4.1 in | |
| February | 43°F (6°C) | 3.2 in | Coldest |
| March | 46°F (8°C) | 2.9 in | |
| April | 48°F (9°C) | 2.1 in | |
| May | 53°F (12°C) | 2.0 in | |
| June | 58°F (14°C) | 1.9 in | |
| July | 62°F (16°C) | 1.6 in | Driest |
| August | 62°F (17°C) | 1.9 in | Warmest |
| September | 60°F (15°C) | 2.7 in | |
| October | 55°F (13°C) | 3.6 in | |
| November | 50°F (10°C) | 4.3 in | Wettest |
| December | 46°F (8°C) | 4.1 in |
Castel has a seasonal temperature swing of 19°F / from 43°F in February to 62°F in August. Total annual precipitation is 34.4 inches, with November being the wettest month (4.3") and July the driest (1.6").