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Chamonix-Mont-Blanc, Auvergne-Rhône-Alpes climate
Cfb Oceanic / temperate
Chamonix-Mont-Blanc has a seasonal cool-temperate climate (Oceanic / temperate, Köppen Cfb). The hottest month is July with an average daily high near 76°F, while the coldest is January averaging around 20°F at night. Precipitation is fairly even year-round, totalling about 50 inches. Snowfall is heavy (84 inches of snow per year on average).
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation split into rain and snow · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Chamonix-Mont-Blanc climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 38 | 42 | 50 | 57 | 65 | 72 | 76 | 75 | 67 | 59 | 47 | 37 |
| Avg temp (°F) | 29 | 32 | 39 | 46 | 53 | 59 | 62 | 62 | 55 | 48 | 38 | 30 |
| Avg low (°F) | 20 | 21 | 28 | 34 | 41 | 47 | 49 | 48 | 43 | 37 | 29 | 23 |
| Precipitation (in) | 3.9 | 3.1 | 3.3 | 3.5 | 4.9 | 4.9 | 5.0 | 5.1 | 3.8 | 4.2 | 3.9 | 4.5 |
| Snowfall (in) | 20.5 | 17.8 | 8.2 | 4.9 | 0.3 | — | — | — | — | 0.6 | 9.3 | 22.0 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 38 | 42 | 50 | 57 | 65 | 72 |
| Avg temp (°F) | 29 | 32 | 39 | 46 | 53 | 59 |
| Avg low (°F) | 20 | 21 | 28 | 34 | 41 | 47 |
| Precipitation (in) | 3.9 | 3.1 | 3.3 | 3.5 | 4.9 | 4.9 |
| Snowfall (in) | 20.5 | 17.8 | 8.2 | 4.9 | 0.3 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 76 | 75 | 67 | 59 | 47 | 37 |
| Avg temp (°F) | 62 | 62 | 55 | 48 | 38 | 30 |
| Avg low (°F) | 49 | 48 | 43 | 37 | 29 | 23 |
| Precipitation (in) | 5.0 | 5.1 | 3.8 | 4.2 | 3.9 | 4.5 |
| Snowfall (in) | — | — | — | 0.6 | 9.3 | 22.0 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 66 | 67 | 69 | 72 | 73 | 65 | 56 | 56 | 60 | 64 | 68 | 68 |
| Relative humidity (%) | 85 | 86 | 86 | 80 | 78 | 77 | 75 | 73 | 77 | 79 | 84 | 84 |
| Wind speed (mph) | 2.3 | 2.3 | 2.1 | 2.0 | 1.8 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.8 | 2.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 66 | 67 | 69 | 72 | 73 | 65 |
| Relative humidity (%) | 85 | 86 | 86 | 80 | 78 | 77 |
| Wind speed (mph) | 2.3 | 2.3 | 2.1 | 2.0 | 1.8 | 1.7 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 56 | 56 | 60 | 64 | 68 | 68 |
| Relative humidity (%) | 75 | 73 | 77 | 79 | 84 | 84 |
| Wind speed (mph) | 1.7 | 1.7 | 1.7 | 1.7 | 1.8 | 2.1 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Chamonix, a weather station, inside the city. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.