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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 24°C, while the coldest is January averaging around −7°C at night. Precipitation is fairly even year-round, totalling about 1268 mm. Snowfall is heavy (212 cm 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 (°C) | 3 | 6 | 10 | 14 | 18 | 22 | 24 | 24 | 20 | 15 | 8 | 3 |
| Avg temp (°C) | −2 | 0 | 4 | 8 | 12 | 15 | 17 | 17 | 13 | 9 | 3 | −1 |
| Avg low (°C) | −7 | −6 | −2 | 1 | 5 | 8 | 9 | 9 | 6 | 3 | −2 | −5 |
| Precipitation (mm) | 99 | 78 | 83 | 88 | 124 | 124 | 128 | 130 | 96 | 106 | 99 | 114 |
| Snowfall (cm) | 52 | 45 | 21 | 13 | 1 | — | — | — | — | 1 | 24 | 56 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 3 | 6 | 10 | 14 | 18 | 22 |
| Avg temp (°C) | −2 | 0 | 4 | 8 | 12 | 15 |
| Avg low (°C) | −7 | −6 | −2 | 1 | 5 | 8 |
| Precipitation (mm) | 99 | 78 | 83 | 88 | 124 | 124 |
| Snowfall (cm) | 52 | 45 | 21 | 13 | 1 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 24 | 24 | 20 | 15 | 8 | 3 |
| Avg temp (°C) | 17 | 17 | 13 | 9 | 3 | −1 |
| Avg low (°C) | 9 | 9 | 6 | 3 | −2 | −5 |
| Precipitation (mm) | 128 | 130 | 96 | 106 | 99 | 114 |
| Snowfall (cm) | — | — | — | 1 | 24 | 56 |
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 (m/s) | 1.0 | 1.0 | 1.0 | 0.9 | 0.8 | 0.8 | 0.8 | 0.8 | 0.7 | 0.8 | 0.8 | 0.9 |
| 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 (m/s) | 1.0 | 1.0 | 1.0 | 0.9 | 0.8 | 0.8 |
| 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 (m/s) | 0.8 | 0.8 | 0.7 | 0.8 | 0.8 | 0.9 |
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.