Climate Chart of Chamonix Mont-Blanc, France

Monthly data: Temperature °C, Rain (mm), Sunshine (h) · 2013–2023

Climate overview

Temperature

The monthly mean temperature is lowest in January, at -1.3 °C, and reaches its highest point in July, at 17.7 °C. These are monthly averages rather than daytime maximum temperatures, so they cannot show how warm or cold an individual afternoon or night may be. The unweighted mean across monthly means is 8.0 °C, a broad summary rather than a day-weighted annual average.

Snow

Mean daily snowfall is highest in January, at 28.23 mm/day; the unweighted mean across monthly means is 11.76 mm/day. These are average daily amounts, not monthly totals. They do not establish how many days have snowfall, how deep snow becomes, whether snow cover persists, or what conditions are suitable for skiing.

Rain

Mean daily rainfall is lowest in February, at 1.26 mm/day, and highest in May, at 6.24 mm/day. These are daily mean amounts for the respective months, not monthly totals; they do not indicate how often rain falls or guarantee conditions on a particular day. The unweighted mean of the monthly daily means is 3.26 mm/day, useful as a general reference but not a day-weighted annual average.

Sunshine

Mean daily sunshine reaches its highest value in July, at 12.05 hours/day, and its lowest in December, at 5.01 hours/day. These sunshine-duration averages can help indicate the relative opportunity for outdoor daylight activities, but they are not measures of day length or a promise of uninterrupted sunshine. The unweighted mean across monthly means is 8.56 hours/day.

Best Travel Time Guide for Chamonix Mont-Blanc, France: Ideal Seasons and Weather Insights

For visitors prioritising lower average rainfall, February is a conditional option: mean daily rainfall is 1.26 mm/day. This is an average, not a guarantee of dry days or a measure of rain frequency, so flexible plans and weather-appropriate rain protection remain sensible. If cooler monthly mean temperatures are the priority, consider January, when the mean is -1.3 °C; this does not describe daytime highs or the conditions on a specific date. For preparation, note that mean daily rainfall is highest in May at 6.24 mm/day, which supports bringing rain protection without implying that every day will be wet.

For outdoor plans guided by average sunshine duration, July records 12.05 hours/day per day, while December records 5.01 hours/day per day. Sunshine hours are not day length and cannot guarantee clear skies, so use these figures as broad planning context rather than a forecast. The mean daily snowfall reaches its highest value in January, at 28.23 mm/day. That average alone cannot tell visitors how many snowy days to expect, whether snow cover will be present, or what recreational conditions will be like.

Climate Data Overview for Chamonix Mont-Blanc, France

Explore the comprehensive climate data for Chamonix Mont-Blanc, France. This detailed table provides valuable insights into temperature variations, precipitation levels, and seasonal changes, helping you understand the unique weather patterns of this region.

• See also climate change in Chamonix Mont-Blanc
• Explore the climate in France