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Weather extremes

How extreme does Mikkeli's weather get?

The hottest, coldest, wettest and snowiest days Mikkeli 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 Mikkeli station 4 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 Mikkeli has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
92°F Aug 8, 2010

That is about 23°F hotter than a normal August afternoon in Mikkeli (typical high near 69°F).

The three most extreme on record

1 92°F Aug 8, 2010
2 92°F Jun 22, 2021
3 91°F Jul 13, 2010
❄️ Coldest night
-33°F Feb 9, 1999

About 44°F colder than a normal February night in Mikkeli (typical low near 11°F).

The three most extreme on record

1 -33°F Feb 9, 1999
2 -33°F Jan 7, 2003
3 -32°F Feb 18, 2011
🌧️ Most rain in one day
3.90 in Jan 3, 1996

The three most extreme on record

1 3.90 in Jan 3, 1996
2 3.90 in Jan 4, 1996
3 1.97 in Jun 27, 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 92°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Mikkeli's record heat sits well above even a hot day for the season — August's 92°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, Mikkeli's warmest days reach the low 70s°F and its coldest nights drop to the low 10s°F. But across the record it has gone as high as 92°F and as low as −33°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 29 years of daily observations at Lappeenranta Lentoasema, a weather station, about 86 km from the city centre. The underlying daily records come from NOAA's global station network.

How we build these numbers →