Weather in Chamonix-Mont-Blanc in April

A hard month. April asks something of you. Go in knowing what. Highs sit at 11.5 °C and the day is short; this is an indoors-with-excursions month, not an outdoors-all-day one.

April ranks 7 of 12 in Chamonix-Mont-Blanc: past the worst of the year but short of September, which is the month to book if the dates are open.

Rain on 13 days, 2 of them heavy. Enough to need a plan B, not enough to need a plan around it. Layers, and a genuinely waterproof outer — at 11.5 °C the difference between a good day and a miserable one is entirely down to what you are wearing.

What the averages hide

Averages flatten a month, and this one hides a few things: 7 nights fall below freezing. Across the twenty years measured, the hottest April day reached 22.4 °C and the coldest night fell to -12.2 °C.

April is moderately variable: 17 mm in the driest year against 145 mm in the wettest, around an average of 74 mm. Roughly two Aprils in three land near that average, and the third does something else entirely.

Wind is light at 3.2 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 80%, which at 11.5 °C means damp rather than muggy — the kind of cold that gets into a coat and stays there.

How April sits in the year

The month is on the way up: 6.3 °C warmer than March, and May adds another 4.7 °C. Late in the month feels noticeably different from the start of it, which is worth knowing if the trip is short. Rain is the thing that moves: May brings 5 days more of it, so the earlier half of a flexible trip is the safer half.

Daylight in April

13.5 hours of daylight, gaining 1.5 hours across the month. That is between Chamonix-Mont-Blanc's extremes of 15.7 and 8.7 hours, so days are long enough not to constrain the plan.

An inland climate

With no coast nearby, the year swings a fair way — 28.9 °C between the warmest afternoons and the coldest nights, wider than any coastal city at this latitude would manage. At 1060 m the air is thin enough to matter — sun that burns faster than the temperature suggests, and nights that cool off quickly.

How busy it gets

Shoulder. The value months — prices ease off and you get the place closer to itself.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

April in Chamonix-Mont-Blanc versus nearby

If Chamonix-Mont-Blanc is one option among several, the nearby comparison is worth making. Annecy is a better bet in April — 4 °C warmer, 2 days less rain. Zermatt is the weaker option in April — 4.6 °C cooler, the same number of rain days.

So: April is a compromise. September is 24 points better and is what Chamonix-Mont-Blanc is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in Chamonix-Mont-Blanc

See all twelve months in Chamonix-Mont-Blanc, or where else to go in April.