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Weather extremes

How extreme does Sanjō's weather get?

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

🔥 Hottest day
104°F Aug 23, 2018

That is about 17°F hotter than a normal August afternoon in Sanjō (typical high near 87°F).

The three most extreme on record

1 104°F Aug 23, 2018
2 103°F Aug 15, 2019
3 102°F Aug 14, 2019
❄️ Coldest night
21°F Jan 15, 2018

About 11°F colder than a normal January night in Sanjō (typical low near 32°F).

The three most extreme on record

1 21°F Jan 15, 2018
2 21°F Jan 30, 2023
3 22°F Jan 25, 2023
🌧️ Most rain in one day
10.43 in Aug 4, 1998

More rain in a single day than Sanjō usually gets in the whole month of August (typical August total about 6.2 in).

The three most extreme on record

1 10.43 in Aug 4, 1998
2 5.35 in Aug 6, 2025
3 5.16 in Jul 15, 2002

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 104°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Sanjō's record heat sits well above even a hot day for the season — August's 104°F is about 17°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, Sanjō'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 104°F and as low as 21°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 Sanjo, about 3 km from the city centre.

How we build these numbers →