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Weather extremes

How extreme does Kasama's weather get?

The hottest, coldest, wettest and snowiest days Kasama 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 Mito station 18 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 Kasama has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
101°F Aug 15, 1996

That is about 15°F hotter than a normal August afternoon in Kasama (typical high near 86°F).

The three most extreme on record

1 101°F Aug 15, 1996
2 101°F Jul 5, 1997
3 100°F Jul 24, 2024
❄️ Coldest night
16°F Feb 2, 1996

About 13°F colder than a normal February night in Kasama (typical low near 29°F).

The three most extreme on record

1 16°F Feb 2, 1996
2 16°F Feb 3, 1996
3 18°F Jan 27, 2018
🌧️ Most rain in one day
8.27 in Aug 2, 1999

More rain in a single day than Kasama usually gets in the whole month of August (typical August total about 4.7 in).

The three most extreme on record

1 8.27 in Aug 2, 1999
2 8.03 in Sep 19, 1991
3 7.99 in Sep 22, 1996

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.

-10°10°30°50°70°90°110°130° all-time high 101°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Kasama's record heat sits well above even a hot day for the season — August's 101°F is about 15°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, Kasama's warmest days reach the mid-80s°F and its coldest nights drop to the high 20s°F. But across the record it has gone as high as 101°F and as low as 16°F. A single day has delivered over 8 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 — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Kasama, about 3 km from the city centre.

How we build these numbers →