Best time to visit Chamonix-Mont-Blanc
Month-by-month weather averages for Chamonix-Mont-Blanc.
Chamonix-Mont-Blanc, Auvergne-Rhone-Alpes, France
°C
mm
- Average daily high and low
- Precipitation
- Good month
- Best month
- Made good or best by an event
| Month | Average daily high | Average daily low | Precipitation | Verdict |
|---|---|---|---|---|
| January | -2.1 °C / 28 °F | -10.8 °C / 13 °F | 170 mm / 6.7 in | neither best nor good |
| February | 0.2 °C / 32 °F | -9.2 °C / 15 °F | 122 mm / 4.8 in | neither best nor good |
| March | 3.5 °C / 38 °F | -5.9 °C / 21 °F | 150 mm / 5.9 in | neither best nor good |
| April | 7.9 °C / 46 °F | -2 °C / 28 °F | 123 mm / 4.8 in | neither best nor good |
| May | 11.7 °C / 53 °F | 2.1 °C / 36 °F | 203 mm / 8 in | neither best nor good |
| June | 16.6 °C / 62 °F | 6.5 °C / 44 °F | 159 mm / 6.3 in | neither best nor good |
| July | 18.6 °C / 65 °F | 8.2 °C / 47 °F | 164 mm / 6.4 in | good month |
| August | 18.1 °C / 65 °F | 7.8 °C / 46 °F | 146 mm / 5.7 in | good month |
| September | 14.3 °C / 58 °F | 4.5 °C / 40 °F | 122 mm / 4.8 in | neither best nor good |
| October | 10.4 °C / 51 °F | 1.1 °C / 34 °F | 125 mm / 4.9 in | neither best nor good |
| November | 3.7 °C / 39 °F | -5.2 °C / 23 °F | 153 mm / 6 in | neither best nor good |
| December | -1.4 °C / 29 °F | -9.7 °C / 15 °F | 204 mm / 8 in | neither best nor good |
Good and best months depend on more than temperature, rain and events. How they are chosen
Each activity on this page has its own good and best months, rated on twenty years of daily weather records. Which measures count, and how much, depends on the activity: humidity for exploring outdoors, wind for the beach, hiking and skiing, snow for skiing alone. Between them, the activities are rated on:
- Daytime highs
- Night-time lows
- How warm it feels
- Humidity
- How much of the day is sunny
- Hours of daylight
- Monthly rainfall
- How many days it rains
- Days of heavy rain
- Wind
- Snowfall and days with snow
- Major events, such as festivals
The chart shows the good and best months for exploring outdoors.
The event icon marks a month that an event lifts to good or best, such as a festival or a natural spectacle. Choose “Weather only” in the toolbar to rate the months on weather alone.
Best months by activity
Exploring outdoors
Mild days and nights, mostly dry and bright. The default for 'when should I go'.
- JJanuary: neither
- FFebruary: neither
- MMarch: neither
- AApril: neither
- MMay: neither
- JJune: neither
- JJuly: good
- AAugust: good
- SSeptember: neither
- OOctober: neither
- NNovember: neither
- DDecember: neither
- Good
- July–August
Why these months
July · good
In its favour: feels like (high) 18.7 °C / 66 °F, average daily high 18.6 °C / 65 °F, share of daylight that is sunny 76%, average daily low 8.2 °C / 47 °F, relative humidity 76%.
Against: wet days 18.7 days, precipitation 164 mm / 6.4 in, days with heavy rain 6.3 days.
August · good
In its favour: feels like (high) 17.9 °C / 64 °F, average daily high 18.1 °C / 65 °F, share of daylight that is sunny 76%, average daily low 7.8 °C / 46 °F.
Against: wet days 16.6 days, precipitation 146 mm / 5.7 in, days with heavy rain 5.2 days, relative humidity 77%.
Hiking and trekking
Cool enough to climb in, dry enough to enjoy, long enough days.
- JJanuary: neither
- FFebruary: neither
- MMarch: neither
- AApril: neither
- MMay: neither
- JJune: neither
- JJuly: neither
- AAugust: neither
- SSeptember: good
- OOctober: neither
- NNovember: neither
- DDecember: neither
- Good
- September
Why these months
September · good
In its favour: average daily high 14.3 °C / 58 °F, feels like (high) 13.2 °C / 56 °F, average daily low 4.5 °C / 40 °F, precipitation 122 mm / 4.8 in, share of daylight that is sunny 73%, daylight per day 12.5 h, wind (daily max) 6 km/h / 4 mph.
Against: wet days 15.1 days, days with heavy rain 4.4 days.
Skiing and snow
Wants cold and snowfall; sunshine barely matters.
- JJanuary: best
- FFebruary: best
- MMarch: best
- AApril: best
- MMay: good
- JJune: neither
- JJuly: neither
- AAugust: neither
- SSeptember: neither
- OOctober: good
- NNovember: best
- DDecember: best
- Best
- November–April
- Good
- May, October
Why these months
January · best
In its favour: snowfall 110 cm / 43.2 in, average daily high -2.1 °C / 28 °F, days with snow 17.5 days, average daily low -10.8 °C / 13 °F, wind (daily max) 7 km/h / 4 mph, daylight per day 9.1 h.
February · best
In its favour: snowfall 79 cm / 31.1 in, average daily high 0.2 °C / 32 °F, days with snow 15.1 days, average daily low -9.2 °C / 15 °F, wind (daily max) 7 km/h / 4 mph, daylight per day 10.4 h.
March · best
In its favour: snowfall 93 cm / 36.5 in, days with snow 17.5 days, average daily high 3.5 °C / 38 °F, average daily low -5.9 °C / 21 °F, wind (daily max) 7 km/h / 4 mph, daylight per day 11.9 h.
April · best
In its favour: snowfall 51 cm / 20 in, days with snow 12.3 days, average daily low -2 °C / 28 °F, wind (daily max) 7 km/h / 4 mph, daylight per day 13.6 h.
Against: average daily high 7.9 °C / 46 °F.
May · good
In its favour: snowfall 31 cm / 12 in, days with snow 8.3 days, wind (daily max) 7 km/h / 4 mph, daylight per day 15 h.
Against: average daily high 11.7 °C / 53 °F, average daily low 2.1 °C / 36 °F.
October · good
In its favour: snowfall 21 cm / 8.2 in, days with snow 5.8 days, wind (daily max) 7 km/h / 4 mph, daylight per day 10.9 h.
Against: average daily high 10.4 °C / 51 °F, average daily low 1.1 °C / 34 °F.
November · best
In its favour: snowfall 73 cm / 28.9 in, days with snow 13.8 days, average daily high 3.7 °C / 39 °F, average daily low -5.2 °C / 23 °F, wind (daily max) 7 km/h / 4 mph, daylight per day 9.5 h.
December · best
In its favour: snowfall 122 cm / 48 in, average daily high -1.4 °C / 29 °F, days with snow 17.4 days, average daily low -9.7 °C / 15 °F, wind (daily max) 7 km/h / 5 mph, daylight per day 8.7 h.
An activity is listed only where it applies: skiing at ski destinations, beach and swimming at beach destinations. The nearest ski area is Brévent/Flégère (Chamonix), 0 km away.
Weather averages
Monthly averages over twenty years, 2006–2025. Highs, lows and precipitation are in the chart at the top.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels like (high) | -5.7 °C | -3.2 °C | 0.5 °C | 5.8 °C | 10.5 °C | 16.4 °C | 18.7 °C | 17.9 °C | 13.2 °C | 8.3 °C | 0.8 °C | -4.8 °C |
| Days with heavy rain | 6.3 days | 4.8 days | 5.6 days | 4.2 days | 7.8 days | 6.5 days | 6.3 days | 5.2 days | 4.4 days | 4.7 days | 5.2 days | 7.2 days |
| Time rain usually falls | 2 am | 4 pm | 12 am | 4 pm | 6 pm | 4 pm | 4 pm | 4 pm | 4 pm | 9 pm | 9 am | 7 pm |
| Sunshine per day | 5.9 h | 7.2 h | 8.5 h | 10.3 h | 10.2 h | 11.2 h | 11.7 h | 10.6 h | 9.1 h | 7.9 h | 6.3 h | 5.4 h |
| Relative humidity | 77% | 75% | 74% | 73% | 78% | 77% | 76% | 77% | 81% | 81% | 80% | 77% |
Air quality
Averaged over a shorter period (2022–2025) than the twenty-year averages above, and not counted towards good or best months.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Air pollution (PM2.5) 2022–2025 | 6.1 µg/m³ | 8.7 µg/m³ | 8 µg/m³ | 7 µg/m³ | 7.4 µg/m³ | 10.8 µg/m³ | 7.6 µg/m³ | 7.5 µg/m³ | 5.8 µg/m³ | 5.1 µg/m³ | 4.4 µg/m³ | 6 µg/m³ |
| Air pollution (PM2.5, daily peak) 2022–2025 | 11.5 µg/m³ | 15.6 µg/m³ | 14.7 µg/m³ | 11.9 µg/m³ | 13.2 µg/m³ | 16.9 µg/m³ | 13.1 µg/m³ | 11.9 µg/m³ | 9.9 µg/m³ | 9.2 µg/m³ | 8.8 µg/m³ | 11.1 µg/m³ |
- Good 15 µg/m³ or less
- Fair 15 to 25 µg/m³
- Moderate 25 to 37.5 µg/m³
- Poor 37.5 to 50 µg/m³
- Very poor 50 to 75 µg/m³
- Extremely poor over 75 µg/m³
Each figure is compared with the World Health Organization's guideline for a day's air, 15 µg/m³ or less, and with its interim targets above that. The words are ours: the WHO does not name its steps. The figures are modelled monthly averages, so single days can be well above them. The daily peak is the average of each day's highest hour, shaded on the same scale.