Best time to visit Chamonix-Mont-Blanc

Chamonix-Mont-Blanc is a city of two halves. September scores 73 and January scores 14 — a 59-point swing, which is the difference between a holiday and an endurance test. The month you pick matters more here than almost anywhere. The good window runs June to September — 4 months within ten points of the best.

July is the warmest month at 22.2 °C and January the coolest at 1.8 °C — a 20.4 °C spread across the year. At the other end, 125 nights a year fall below freezing: the winter here is a real one.

There is a real wet season here. May to July carry the rain — up to 18 wet days in a month — while February and October drop as low as 11. That 7-day gap is the biggest single difference between a good month and a bad one in Chamonix-Mont-Blanc, and it moves further than the temperature does.

Daylight runs from 8.7 hours in winter to 15.7 in summer, enough to notice on a sightseeing itinerary.

The three strongest months are September, August, June. The one to think twice about is January. Each month below has its own page with rainfall reliability, extremes, daylight and crowd levels.

Chamonix-Mont-Blanc month by month