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Weather & Climate in Chamonix-Mont-Blanc, France
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Chamonix-Mont-Blanc has a cool climate with an average annual temperature of 31°F (-1°C). Winters average 19°F in January while summers reach 45°F in July. The area gets 232 sunny days per year, above the national average. Annual precipitation totals 57.4 inches (wetter than the 38-inch national average). The area receives 42.0 inches of snow annually, making winter weather a significant factor for residents. The city sits at an elevation of 3,478 feet.
Temperature
19°F Jan (-7°C)
45°F Jul (7°C)
| Annual Average | 31.0°F |
| 43% below US avg | |
| January Average | 19°F (-7°C) |
| July Average | 45°F (7°C) |
| Sunny Days | 232 days/yr |
Geography
| Elevation | 3,478 ft (1,060 m) |
| Area | 45.0 sq mi (116.5 km²) |
| Population Density | 236/sq mi |
| Coordinates | 45.9238°N, 6.8693°W |
| Timezone | Europe/Paris |
Precipitation & Snow
Air Quality
Earthquake History
1,181 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.8.
| Apr 7, 2014 | 7 km SE of Guillestre, France | M4.8 | 147 km | 8 km |
| Feb 14, 1999 | 3 km NNE of Belfaux, Switzerland | M4.7 | 105 km | 10 km |
| Feb 11, 1991 | 5 km ESE of Briançon, France | M4.6 | 118 km | 14 km |
| Dec 14, 1994 | 7 km SSE of Amancy, France | M4.5 | 41 km | 10 km |
| Jul 15, 1996 | 3 km NE of Chilly, France | M4.5 | 70 km | 5 km |
| Mar 12, 2022 | 3 km S of Faverges, France | M4.5 | 51 km | 3 km |
| Jul 23, 1996 | 4 km W of Choisy, France | M4.4 | 67 km | 10 km |
| Nov 21, 1995 | 1 km SW of Collegno, Italy | M4.4 | 109 km | 22 km |
| Jun 14, 1993 | 3 km S of Vogogna, Italy | M4.4 | 111 km | 10 km |
| Jul 25, 2011 | 5 km NW of Cantalupa, Italy | M4.4 | 110 km | 25 km |
| May 24, 1995 | 7 km NE of Le Chenit, Switzerland | M4.4 | 91 km | 6 km |
| Jun 30, 2010 | 3 km NW of Saint-Martin-de-Belleville, France | M4.3 | 65 km | 2 km |
| Feb 11, 1990 | northern Italy | M4.3 | 117 km | 10 km |
| Apr 29, 2003 | 2 km SSW of Varen, Switzerland | M4.3 | 70 km | 8 km |
| Mar 31, 1996 | 7 km NNW of Bionaz, Italy | M4.3 | 41 km | 5 km |
| Jun 10, 2003 | 1 km NNE of Piobesi Torinese, Italy | M4.2 | 140 km | 20 km |
| Jan 11, 1999 | 2 km W of Saint-Paul-de-Varces, France | M4.2 | 136 km | 10 km |
| Jul 30, 2016 | 0 km SSW of Fleccia-Chianavasso, Italy | M4.2 | 113 km | 11 km |
| May 14, 2004 | 0 km SSE of Chiusa di San Michele, Italy | M4.2 | 98 km | 10 km |
| May 20, 1999 | 4 km SSE of Plaffeien, Switzerland | M4.2 | 92 km | 2 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tsunami History
2 tsunamis recorded within 500 km. Highest wave on record: 0.5 m (2 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1996 | LAKE BRIENZ | Meteorological | 0.5 m | — | 123 km |
| 563 | LAKE GENEVA | Meteorological | — | — | 49 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 19°F (-7°C) | 5.5 in | |
| February | 19°F (-7°C) | 5.4 in | Coldest |
| March | 21°F (-6°C) | 5.1 in | |
| April | 24°F (-4°C) | 4.7 in | |
| May | 33°F (1°C) | 4.7 in | |
| June | 39°F (4°C) | 4.2 in | |
| July | 45°F (7°C) | 3.6 in | Driest |
| August | 47°F (8°C) | 3.9 in | Warmest |
| September | 41°F (5°C) | 3.8 in | |
| October | 35°F (1°C) | 4.9 in | |
| November | 26°F (-3°C) | 5.9 in | Wettest |
| December | 22°F (-6°C) | 5.8 in |
Chamonix-Mont-Blanc has a seasonal temperature swing of 28°F / from 19°F in February to 47°F in August. Total annual precipitation is 57.4 inches, with November being the wettest month (5.9") and July the driest (3.6").