All Countries
Weather & Climate in Grande-Synthe, France
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Grande-Synthe experiences four distinct seasons with an average annual temperature of 54°F (12°C). Winters average 43°F in January while summers reach 65°F in July. The area gets 225 sunny days per year, above the national average. Annual precipitation totals 39.9 inches. The area receives 5.7 inches of snow annually. The city sits at an elevation of 7 feet.
Temperature
43°F Jan (6°C)
65°F Jul (18°C)
| Annual Average | 53.6°F |
| 1% below US avg | |
| January Average | 43°F (6°C) |
| July Average | 65°F (18°C) |
| Sunny Days | 225 days/yr |
Geography
| Elevation | 7 ft (2 m) |
| Area | 8.3 sq mi (21.4 km²) |
| Population Density | 2,804/sq mi |
| Coordinates | 51.0154°N, 2.2998°W |
| Timezone | Europe/Paris |
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 | 91 km | 10 km |
| Jun 20, 1995 | 1 km N of Ghlin, Belgium | M4.3 | 127 km | 20 km |
| Jan 23, 2007 | 57 km ENE of Broadstairs, United Kingdom | M4.1 | 71 km | 10 km |
| Dec 14, 1991 | 3 km SSE of Longfossé, France | M4.0 | 55 km | 10 km |
| Sep 15, 1994 | 38 km NE of Broadstairs, United Kingdom | M3.9 | 77 km | 10 km |
| Jan 27, 1998 | 27 km W of Le Touquet-Paris-Plage, France | M3.8 | 96 km | 2 km |
| May 22, 2015 | 3 km SSE of Ramsgate, United Kingdom | M3.7 | 68 km | 12 km |
| Jul 20, 1994 | 2 km N of Rousies, France | M3.5 | 144 km | 5 km |
| Mar 3, 2009 | 1 km ENE of Hawkinge, United Kingdom | M3.5 | 79 km | 4 km |
| Jan 27, 1992 | 6 km SSE of Longfossé, France | M3.5 | 56 km | 10 km |
| Feb 13, 1997 | 26 km W of Le Touquet-Paris-Plage, France | M3.2 | 94 km | 5 km |
| Jul 14, 2008 | 1 km SW of Boussu, Belgium | M3.2 | 123 km | 4 km |
| Oct 25, 1998 | 6 km NNE of Montdidier, France | M3.2 | 148 km | 7 km |
| Feb 27, 2005 | 1 km NW of Libercourt, France | M3.1 | 76 km | 4 km |
| Jun 1, 2005 | 3 km N of Grandvilliers, France | M3.1 | 148 km | 10 km |
| May 4, 1990 | 0 km NE of Coquelles, France | M3.1 | 36 km | 10 km |
| Jul 20, 1994 | 1 km NE of Quévy-le-Petit, Belgium | M3.1 | 136 km | 5 km |
| Jul 2, 2001 | 3 km NNE of Oostduinkerke, Belgium | M3.1 | 31 km | 5 km |
| May 1, 1997 | 21 km W of Fort-Mahon-Plage, France | M3.0 | 106 km | 5 km |
| Mar 28, 1996 | 67 km ESE of Aldeburgh, United Kingdom | M3.0 | 98 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 | — | 48 km |
| 1911 | FOLKSTONE, ENGLAND | Meteorological | 0.9 m | — | 75 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 43°F (6°C) | 2.2 in | |
| February | 41°F (5°C) | 1.6 in | Coldest, Driest |
| March | 45°F (7°C) | 1.9 in | |
| April | 48°F (9°C) | 1.8 in | |
| May | 54°F (12°C) | 1.8 in | |
| June | 59°F (15°C) | 2.1 in | |
| July | 65°F (18°C) | 2.0 in | Warmest |
| August | 64°F (18°C) | 1.9 in | |
| September | 60°F (16°C) | 2.6 in | |
| October | 54°F (12°C) | 2.7 in | |
| November | 47°F (8°C) | 2.9 in | Wettest |
| December | 43°F (6°C) | 2.4 in |
Grande-Synthe has a seasonal temperature swing of 24°F / from 41°F in February to 65°F in July. Total annual precipitation is 25.8 inches, with November being the wettest month (2.9") and February the driest (1.6").