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Weather & Climate in Guyancourt, France
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Guyancourt experiences four distinct seasons with an average annual temperature of 53°F (12°C). Winters average 41°F in January while summers reach 66°F in July. The area gets 234 sunny days per year, above the national average. Annual precipitation totals 35.2 inches. The area receives 1.6 inches of snow annually. The city sits at an elevation of 528 feet.
Temperature
41°F Jan (5°C)
66°F Jul (19°C)
| Annual Average | 53.4°F |
| 1% below US avg | |
| January Average | 41°F (5°C) |
| July Average | 66°F (19°C) |
| Sunny Days | 234 days/yr |
Geography
| Elevation | 528 ft (161 m) |
| Area | 5.0 sq mi (13.0 km²) |
| Population Density | 6,372/sq mi |
| Coordinates | 48.7733°N, 2.0739°W |
| Timezone | Europe/Paris |
Precipitation & Snow
Air Quality
Earthquake History
12 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.3.
| Mar 6, 1999 | 2 km W of Vienne-en-Val, France | M3.3 | 108 km | 4 km |
| Aug 29, 1992 | 2 km ESE of Radon, France | M3.2 | 145 km | 10 km |
| Oct 25, 1998 | 6 km NNE of Montdidier, France | M3.2 | 110 km | 7 km |
| Feb 22, 1999 | France | M3.1 | 108 km | 4 km |
| Jun 1, 2005 | 3 km N of Grandvilliers, France | M3.1 | 103 km | 10 km |
| Jan 5, 1994 | 0 km SSE of Saint-Martin-de-Boscherville, France | M2.7 | 109 km | 10 km |
| Nov 3, 2000 | 5 km ESE of Ouzouer-le-Marché, France | M2.6 | 105 km | 5 km |
| Jan 12, 1996 | 2 km NW of Valframbert, France | M2.5 | 150 km | 10 km |
| Dec 13, 1992 | 1 km SW of La Mailleraye-sur-Seine, France | M2.5 | 123 km | 10 km |
| Jan 12, 1999 | 5 km ESE of Ouzouer-le-Marché, France | M2.5 | 103 km | 18 km |
| Jun 11, 1997 | 4 km NE of Voves, France | M2.5 | 60 km | 10 km |
| Jun 22, 1999 | 5 km NNE of Oisemont, France | M2.5 | 138 km | 2 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 41°F (5°C) | 2.1 in | |
| February | 39°F (4°C) | 1.9 in | Coldest |
| March | 45°F (7°C) | 1.9 in | |
| April | 49°F (9°C) | 2.0 in | |
| May | 56°F (13°C) | 2.4 in | Wettest |
| June | 61°F (16°C) | 2.1 in | |
| July | 66°F (19°C) | 2.3 in | Warmest |
| August | 66°F (19°C) | 1.7 in | Driest |
| September | 59°F (15°C) | 2.1 in | |
| October | 52°F (11°C) | 2.4 in | |
| November | 44°F (7°C) | 2.1 in | |
| December | 40°F (5°C) | 2.4 in |
Guyancourt has a seasonal temperature swing of 27°F / from 39°F in February to 66°F in July. Total annual precipitation is 25.4 inches, with May being the wettest month (2.4") and August the driest (1.7").