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Weather extremes

How extreme does Koganei's weather get?

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

🔥 Hottest day
102°F Aug 15, 1996

That is about 14°F hotter than a normal August afternoon in Koganei (typical high near 89°F).

The three most extreme on record

1 102°F Aug 15, 1996
2 102°F Jul 6, 1997
3 102°F Aug 16, 2007
❄️ Coldest night
27°F Jan 14, 2001

About 11°F colder than a normal January night in Koganei (typical low near 37°F).

The three most extreme on record

1 27°F Jan 14, 2001
2 27°F Jan 24, 2018
3 27°F Jan 26, 2018

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 102°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Koganei's record heat sits well above even a hot day for the season — August's 102°F is about 14°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, Koganei's warmest days reach the high 80s°F and its coldest nights drop to the high 30s°F. But across the record it has gone as high as 102°F and as low as 27°F. 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 Fuchu, about 3 km from the city centre.

How we build these numbers →