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Weather extremes

How extreme does Łomża's weather get?

The hottest, coldest, wettest and snowiest days Łomża 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 Ostroleka station 35 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 Łomża has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
98°F Aug 8, 2013

That is about 21°F hotter than a normal August afternoon in Łomża (typical high near 77°F).

The three most extreme on record

1 98°F Aug 8, 2013
2 98°F Aug 9, 2013
3 98°F Jul 31, 1994
❄️ Coldest night
-20°F Jan 26, 2010

About 44°F colder than a normal January night in Łomża (typical low near 23°F).

The three most extreme on record

1 -20°F Jan 26, 2010
2 -18°F Jan 25, 2010
3 -17°F Feb 3, 2012
🌧️ Most rain in one day
4.02 in Sep 3, 1995

More rain in a single day than Łomża usually gets in the whole month of September (typical September total about 2.5 in).

The three most extreme on record

1 4.02 in Sep 3, 1995
2 2.87 in Jun 14, 2019
3 2.52 in Jun 18, 1999

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 98°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Łomża's record heat sits well above even a hot day for the season — August's 98°F is about 21°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, Łomża's warmest days reach the high 70s°F and its coldest nights drop to the low 20s°F. But across the record it has gone as high as 98°F and as low as −20°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 28 years of daily observations at Ostroleka, a weather station, about 35 km from the city centre. The underlying daily records come from NOAA's global station network.

How we build these numbers →