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Weather extremes

How extreme does Yamagata's weather get?

The hottest, coldest, wettest and snowiest days Yamagata 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 Yamagata station 2 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 Yamagata has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
102°F Aug 23, 2018

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

The three most extreme on record

1 102°F Aug 23, 2018
2 102°F Aug 13, 1994
3 101°F Aug 12, 1994
❄️ Coldest night
14°F Jan 17, 1995

About 12°F colder than a normal January night in Yamagata (typical low near 26°F).

The three most extreme on record

1 14°F Jan 17, 1995
2 14°F Feb 6, 1995
3 14°F Jan 16, 1995
🌧️ Most rain in one day
6.14 in Jul 28, 2020

About 83% of a typical July's rain in a single day (Yamagata averages roughly 7.4 in across the month).

The three most extreme on record

1 6.14 in Jul 28, 2020
2 5.49 in Sep 21, 2011
3 5.12 in Aug 10, 1995

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

Yamagata'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, Yamagata's warmest days reach the high 80s°F and its coldest nights drop to the mid-20s°F. But across the record it has gone as high as 102°F and as low as 14°F. A single day has delivered over 6 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 Yamagata, about 3 km from the city centre.

How we build these numbers →