Chamonix-Mont-Blanc Temperature by Month

Chamonix-Mont-Blanc, Rhône-Alps, France has an average annual maximum temperature of 8°C (46°F), ranging from -3°C (27°F) in January to 18°C (64°F) in July. Below you'll find a full monthly breakdown and a comparison with cities worldwide.

Visitors to Chamonix-Mont-Blanc can expect significant temperature changes throughout the year. Nighttime temperatures also vary widely, ranging from 7°C (45°F) in July to -12°C (10°F) in January.

The chart below illustrates the average maximum day and minimum night temperatures in Chamonix-Mont-Blanc by month:

Temperatures tend to bottom out between 4 AM and 6 AM, then climb to their daily peak around 3 PM. July, the warmest month, sees 275 hours of sunshine.

The chart below shows the average temperature throughout the year:

Chamonix-Mont-Blanc's average annual maximum temperature is 8°C (46°F). To put that in context, here's how it compares to a few well-known destinations:

Seville, Spain averages 23°C (73°F) a year, one of the warmer cities in Western Europe, with long hot summers.

Zermatt, Switzerland averages just 4°C (39°F) annually due to its altitude, with very cold winters and cool summers even at its warmest.

Seoul, South Korea averages 18°C (64°F) a year, with four clear seasons, cold winters, and hot humid summers.

Tokyo, Japan averages 21°C (70°F) a year, with hot summers, cool winters, and a well-defined cherry blossom spring.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

For cities and regions with significant elevation, altitude is one of the biggest factors shaping local temperatures. As a rule of thumb, temperatures fall by around 6°C for every 1,000 metres gained, so a city at 2,000 metres will typically be around 12°C cooler than a city at sea level in the same region. Higher ground also tends to see more dramatic day-to-night temperature swings, since thinner air loses heat faster after sunset.

For more on Chamonix-Mont-Blanc's weather, including monthly rainfall, sunshine hours, and humidity, visit our Chamonix-Mont-Blanc climate page.