If you’re seeking a sunny getaway, the ideal months to visit Chamonix Mont Blanc are June, July and August. During this time, the average temperature soars to 20.5 °C. Additionally, the sun shines brightest in July, August, and June, which are the top three sunniest months of the year, offering an impressive average of 127.46 hours of sunshine daily.
On the other hand, if you prefer cooler weather, consider planning your trip to Chamonix Mont Blanc during the months of January, February and December. During these months, the average temperature is -2.99 °C.
For travelers who are less concerned about temperature but want to stay dry, it's wise to steer clear of visiting during January, February and April. During these months, the average precipitation in Chamonix Mont Blanc reaches 5.25 mm. In contrast, the months of January, February and March, are much drier, averaging 0 mm of rainfall.