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Weather extremes

How extreme does Ōshū's weather get?

The hottest, coldest, wettest and snowiest days Ōshū 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 Hanamaki station 32 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 Ōshū has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
100°F Jul 29, 2025

That is about 20°F hotter than a normal July afternoon in Ōshū (typical high near 81°F).

The three most extreme on record

1 100°F Jul 29, 2025recent
2 99°F Aug 1, 2000
3 97°F Aug 9, 1994
❄️ Coldest night
3°F Jan 8, 2021

About 21°F colder than a normal January night in Ōshū (typical low near 24°F).

The three most extreme on record

1 3°F Jan 8, 2021recent
2 5°F Feb 3, 2006
3 5°F Jan 17, 2013

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 100°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Ōshū's record heat sits well above even a hot day for the season — July's 100°F is about 20°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, Ōshū's warmest days reach the low 80s°F and its coldest nights drop to the mid-20s°F. But across the record it has gone as high as 100°F and as low as 3°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 Kitakami, about 17 km from the city centre.

How we build these numbers →