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Weather extremes

How extreme does Kouvola's weather get?

The hottest, coldest, wettest and snowiest days Kouvola 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 Utti station 13 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 Kouvola has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
91°F Aug 7, 2010

That is about 22°F hotter than a normal August afternoon in Kouvola (typical high near 69°F).

The three most extreme on record

1 91°F Aug 7, 2010
2 91°F Jul 30, 1994
3 91°F Jul 14, 2021
❄️ Coldest night
-26°F Feb 12, 1994

About 40°F colder than a normal February night in Kouvola (typical low near 14°F).

The three most extreme on record

1 -26°F Feb 12, 1994
2 -26°F Feb 8, 1999
3 -26°F Jan 2, 2003
🌧️ Most rain in one day
5.24 in Sep 28, 1994

The three most extreme on record

1 5.24 in Sep 28, 1994
2 3.98 in Feb 13, 1993
3 3.94 in Jan 31, 1991

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 91°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Kouvola's record heat sits well above even a hot day for the season — August's 91°F is about 22°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, Kouvola's warmest days reach the low 70s°F and its coldest nights drop to the mid-10s°F. But across the record it has gone as high as 91°F and as low as −26°F. A single day has delivered over 5 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 Kotka Rankki, a weather station, about 56 km from the city centre. The underlying daily records come from NOAA's global station network.

How we build these numbers →