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Weather & Climate in St Mary's Bay, United Kingdom
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
St Mary's Bay experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 40°F in January while summers reach 63°F in July. The area gets 286 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 27.6 inches (drier than the 38-inch national average). The city sits at an elevation of 7 feet.
Temperature
40°F Jan (4°C)
63°F Jul (17°C)
| Annual Average | 50.1°F |
| 7% below US avg | |
| January Average | 40°F (4°C) |
| July Average | 63°F (17°C) |
| Sunny Days | 286 days/yr |
Geography
| Elevation | 7 ft (2 m) |
| Area | 255.9 sq mi (662.7 km²) |
| Population Density | 12/sq mi |
| Coordinates | 51.0100°N, 0.9771°W |
| Timezone | Europe/London |
Precipitation & Snow
Air Quality
Earthquake History
36 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 | 9 km | 10 km |
| Oct 6, 1999 | 34 km NNW of Fécamp, France | M4.6 | 117 km | 1 km |
| Jan 23, 2007 | 57 km ENE of Broadstairs, United Kingdom | M4.1 | 107 km | 10 km |
| Dec 14, 1991 | 3 km SSE of Longfossé, France | M4.0 | 73 km | 10 km |
| Sep 15, 1994 | 38 km NE of Broadstairs, United Kingdom | M3.9 | 89 km | 10 km |
| Jan 27, 1998 | 27 km W of Le Touquet-Paris-Plage, France | M3.8 | 59 km | 2 km |
| May 22, 2015 | 3 km SSE of Ramsgate, United Kingdom | M3.7 | 46 km | 12 km |
| Jan 27, 1992 | 6 km SSE of Longfossé, France | M3.5 | 76 km | 10 km |
| Mar 3, 2009 | 1 km ENE of Hawkinge, United Kingdom | M3.5 | 18 km | 4 km |
| Jun 16, 1998 | 18 km NNW of Yport, France | M3.3 | 138 km | 5 km |
| Feb 27, 2019 | 3 km SE of Dorking, United Kingdom | M3.3 | 92 km | 10 km |
| Sep 9, 1995 | 0 km WNW of East Wittering, United Kingdom | M3.3 | 133 km | 10 km |
| Feb 13, 1997 | 26 km W of Le Touquet-Paris-Plage, France | M3.2 | 57 km | 5 km |
| Jul 2, 2001 | 3 km NNE of Oostduinkerke, Belgium | M3.1 | 121 km | 5 km |
| May 4, 1990 | 0 km NE of Coquelles, France | M3.1 | 59 km | 10 km |
| Aug 26, 2002 | 40 km NNW of Étretat, France | M3.0 | 128 km | 4 km |
| Nov 25, 1998 | 26 km N of Grand-Fort-Philippe, France | M3.0 | 81 km | 10 km |
| Nov 5, 1994 | 5 km N of Debenham, United Kingdom | M3.0 | 141 km | 5 km |
| May 1, 1997 | 21 km W of Fort-Mahon-Plage, France | M3.0 | 78 km | 5 km |
| Mar 28, 1996 | 67 km ESE of Aldeburgh, United Kingdom | M3.0 | 143 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 | — | 44 km |
| 1911 | FOLKSTONE, ENGLAND | Meteorological | 0.9 m | — | 21 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 40°F (4°C) | 2.9 in | Coldest |
| February | 40°F (4°C) | 1.8 in | |
| March | 43°F (6°C) | 2.1 in | |
| April | 47°F (8°C) | 1.8 in | |
| May | 53°F (12°C) | 1.7 in | Driest |
| June | 58°F (15°C) | 2.0 in | |
| July | 63°F (17°C) | 1.7 in | |
| August | 63°F (17°C) | 2.1 in | Warmest |
| September | 58°F (14°C) | 2.6 in | |
| October | 52°F (11°C) | 3.1 in | Wettest |
| November | 44°F (7°C) | 3.1 in | |
| December | 41°F (5°C) | 3.0 in |
St Mary's Bay has a seasonal temperature swing of 23°F / from 40°F in January to 63°F in August. Total annual precipitation is 27.6 inches, with October being the wettest month (3.1") and May the driest (1.7").