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Weather extremes

How extreme does Sumy's weather get?

The hottest, coldest, wettest and snowiest days Sumy 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 Sumy station 12 km away. Updated through June 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 Sumy has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
103°F Aug 5, 2010

That is about 25°F hotter than a normal August afternoon in Sumy (typical high near 78°F).

The three most extreme on record

1 103°F Aug 5, 2010
2 102°F Aug 2, 2010
3 102°F Aug 7, 2010
❄️ Coldest night
-30°F Jan 9, 1987

About 48°F colder than a normal January night in Sumy (typical low near 18°F).

The three most extreme on record

1 -30°F Jan 9, 1987
2 -27°F Feb 10, 1985
3 -23°F Jan 6, 1987
🌧️ Most rain in one day
4.06 in Mar 21, 1993

More rain in a single day than Sumy usually gets in the whole month of March (typical March total about 1.4 in).

The three most extreme on record

1 4.06 in Mar 21, 1993
2 4.02 in Jan 20, 1993
3 3.98 in Aug 25, 1994

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.

-50°-30°-10°10°30°50°70°90°110°130° all-time high 103°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Sumy's record heat sits well above even a hot day for the season — August's 103°F is about 25°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, Sumy's warmest days reach the low 80s°F and its coldest nights drop to the high 10s°F. But across the record it has gone as high as 103°F and as low as −30°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 — 1991–2020 normals computed from 26 years of daily observations at Sumy, a weather station, about 12 km from the city centre. The underlying daily records come from NOAA's global station network.

How we build these numbers →