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Weather extremes

How extreme does Yachiyo's weather get?

The hottest, coldest, wettest and snowiest days Yachiyo 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 Shimofusa station 12 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 Yachiyo has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
102°F Aug 3, 1994

That is about 15°F hotter than a normal August afternoon in Yachiyo (typical high near 87°F).

The three most extreme on record

1 102°F Aug 3, 1994
2 102°F Aug 4, 1994
3 102°F Jul 20, 2004
❄️ Coldest night
19°F Jan 6, 2022

About 13°F colder than a normal January night in Yachiyo (typical low near 33°F).

The three most extreme on record

1 19°F Jan 6, 2022recent
2 21°F Feb 21, 1996
3 21°F Jan 14, 2001
🌧️ Most rain in one day
10.12 in Aug 13, 1993

The three most extreme on record

1 10.12 in Aug 13, 1993
2 3.54 in Jun 13, 2001
3 0.03 in Jun 6, 2001

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

Yachiyo's record heat sits well above even a hot day for the season — August's 102°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, Yachiyo's warmest days reach the high 80s°F and its coldest nights drop to the low 30s°F. But across the record it has gone as high as 102°F and as low as 19°F. A single day has delivered over 10 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 Funabashi, about 8 km from the city centre.

How we build these numbers →