Chamonix-Mont-Blanc · Peak Window

What to expect

What to expect in weeks 1–53

Based on 40 winters of weather data, modelled at ~2522m (not the village). Any single year can be very different.

Typically stormy, around -10.1°C, with 33cm of fresh snow over the week. Powder days hit 60% of the time. Other weeks run mixed or cold and clear.

Icy mornings

0.1 days/week

spring-like in 1% of years

Snow texture

Powdery

soft, easy turns

Typical wind

10.7 m/s

peaks to 31 m/s

Typical Freezing level

888 m

0°C isotherm

Powder days

60%

of years see 10cm+

Rain at base

1.6 days

per week

Storm

47%

of years

Bluebird

20%

of years

Thaw

of years

Mixed

33%

of years

Climatology

What a season here looks like

Each track shows the typical range across 40 winters. The marker shows where your selected weeks sit.

Reliability60cm+

100%

Depth

164cm

Temperature

-10.1°C

Fresh snow

33cm

Snow line

889m

Wind

10.7 m/s

Transfers

Airport	Drive	Train
Geneva (GVA)	78 min	150 min

Method & sources

The composite score weights snow reliability against the historical baseline, pulls in live conditions where available, then adjusts for how much hassle the trip actually is for your group.

01ERA5-Land hourly grid → daily SWE & snow depth at the resort cell.
02Bias-correct against ground stations (SLF / Météo-France nivôse).
03Build per-week climatological percentile · 35 winters.
04Anomaly = current week vs. cell's own 30-year baseline.
05Snow-sure read at the highest-snow cell within ~15km. When most resorts are bare, ranking shifts toward this, surfacing glaciers in shoulder seasons.
06Weight + rank against your origin & vibe profile.

Sources

Snow data sources

Ground stations the score is based on.

LE TOUR BALMEmeteofrance
LA FLEGEREmeteofrance
Lognanmeteofrance
CHAMONIX-OBSmeteofrance