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Weather extremes

How extreme does Heilbronn's weather get?

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

Based on 50+ years of daily weather observations (1971–present), from the Ohringen station 23 km away. Updated through April 2026 — 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 Heilbronn has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
102°F Aug 7, 2015

That is about 24°F hotter than a normal August afternoon in Heilbronn (typical high near 78°F).

The three most extreme on record

1 102°F Aug 7, 2015
2 101°F Jul 5, 2015
3 101°F Jul 25, 2019
❄️ Coldest night
-12°F Jan 9, 1985

About 42°F colder than a normal January night in Heilbronn (typical low near 30°F).

The three most extreme on record

1 -12°F Jan 9, 1985
2 -8°F Jan 8, 1985
3 -5°F Dec 3, 1973
🌧️ Most rain in one day
3.10 in May 29, 2016

More rain in a single day than Heilbronn usually gets in the whole month of May (typical May total about 2.9 in).

The three most extreme on record

1 3.10 in May 29, 2016
2 3.00 in Aug 18, 2016
3 2.93 in Jun 17, 1978

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.

-30°-10°10°30°50°70°90°110°130° all-time high 102°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Heilbronn's record heat sits well above even a hot day for the season — August's 102°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, Heilbronn's warmest days reach the high 70s°F and its coldest nights drop to the low 30s°F. But across the record it has gone as high as 102°F and as low as −12°F. A single day has delivered over 3 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 — 1991–2020 normals computed from 30 years of daily observations at Ohringen, a weather station, about 23 km from the city centre. The underlying daily records come from NOAA's global station network.

How we build these numbers →