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Weather extremes

How extreme does Olsztyn's weather get?

The hottest, coldest, wettest and snowiest days Olsztyn 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 Olsztyn station 5 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 Olsztyn has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
97°F Aug 10, 1992

That is about 23°F hotter than a normal August afternoon in Olsztyn (typical high near 74°F).

The three most extreme on record

1 97°F Aug 10, 1992
2 97°F Aug 29, 1992
3 97°F Jul 31, 1994
❄️ Coldest night
-23°F Nov 21, 1998

About 56°F colder than a normal November night in Olsztyn (typical low near 34°F).

The three most extreme on record

1 -23°F Nov 21, 1998
2 -19°F Jan 23, 2006
3 -19°F Jan 7, 2003
🌧️ Most rain in one day
5.91 in Jan 25, 2016

More rain in a single day than Olsztyn usually gets in the whole month of January (typical January total about 2.2 in).

The three most extreme on record

1 5.91 in Jan 25, 2016
2 5.51 in Jan 22, 2021
3 4.33 in Jan 13, 2016

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° all-time high 97°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Olsztyn's record heat sits well above even a hot day for the season — August's 97°F is about 23°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, Olsztyn's warmest days reach the mid-70s°F and its coldest nights drop to the mid-20s°F. But across the record it has gone as high as 97°F and as low as −22°F. A single day has delivered over 6 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 Olsztyn, a weather station, about 5 km from the city centre. The underlying daily records come from NOAA's global station network.

How we build these numbers →