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Weather extremes

How extreme does Kamikoizumi's weather get?

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

🔥 Hottest day
106°F Jul 23, 2018

That is about 18°F hotter than a normal July afternoon in Kamikoizumi (typical high near 88°F).

The three most extreme on record

1 106°F Jul 23, 2018
2 106°F Aug 16, 2007
3 104°F Aug 5, 2025
❄️ Coldest night
20°F Jan 15, 2001

About 10°F colder than a normal January night in Kamikoizumi (typical low near 30°F).

The three most extreme on record

1 20°F Jan 15, 2001
2 21°F Jan 9, 2021
3 21°F Jan 14, 2001
🌧️ Most rain in one day
8.78 in Oct 12, 2019

More rain in a single day than Kamikoizumi usually gets in the whole month of October (typical October total about 7.0 in).

The three most extreme on record

1 8.78 in Oct 12, 2019
2 7.92 in Aug 14, 1999
3 7.87 in Aug 2, 1994

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°30°50°70°90°110°130° all-time high 106°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Kamikoizumi's record heat sits well above even a hot day for the season — July's 106°F is about 18°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, Kamikoizumi's warmest days reach the low 90s°F and its coldest nights drop to the low 30s°F. But across the record it has gone as high as 106°F and as low as 20°F. A single day has delivered over 9 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 Tatebayashi, about 8 km from the city centre.

How we build these numbers →