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Weather extremes

How extreme does Annecy's weather get?

The hottest, coldest, wettest and snowiest days Annecy has recorded — the outer limits of what its weather can do, and how far they sit beyond a normal day.

Based on 34 years of daily weather observations (1991–present), from the Chambery Aix Les Bains station 36 km away. Updated through August 2025 — an all-time extreme only changes when a more extreme day actually occurs, so some dates are old. That is normal, not stale data.

The four kinds of extreme

The hottest, coldest, wettest and snowiest single days Annecy has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
105°F Aug 24, 2023

That is about 24°F hotter than a normal August afternoon in Annecy (typical high near 81°F).

The three most extreme on record

1 105°F Aug 24, 2023recent
2 102°F Aug 11, 2003
3 102°F Aug 4, 2022
❄️ Coldest night
6°F Feb 5, 2012

About 25°F colder than a normal February night in Annecy (typical low near 31°F).

The three most extreme on record

1 6°F Feb 5, 2012
2 10°F Dec 20, 2009
3 10°F Dec 30, 2005
🌧️ Most rain in one day
3.76 in Sep 26, 1999

About 96% of a typical September's rain in a single day (Annecy averages roughly 3.9 in across the month).

The three most extreme on record

1 3.76 in Sep 26, 1999
2 3.66 in Dec 22, 1991
3 2.92 in Jul 23, 2015

How hot and cold it gets, month by month

The shaded band is the normal range of daily temperatures for each month. The dots show the most extreme it has ever been — so you can see how far beyond a normal day the records really sit.

-10°10°30°50°70°90°110°130° all-time high 105°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Annecy's record heat sits well above even a hot day for the season — August's 105°F is about 24°F beyond a normal hot afternoon. Its record cold is just as far below a normal winter night — the dots mark how rare each extreme really is.

In plain terms

In a normal year, Annecy's warmest days reach the low 80s°F and its coldest nights drop to the low 30s°F. But across the record it has gone as high as 105°F and as low as 6°F. A single day has delivered over 4 inches of rain. Those are the outer edges worth knowing if you are moving here, planning a trip, or thinking about a house.
Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from a national meteorological service, measured at Genève / Cointrin, about 38 km from the city centre.

How we build these numbers →