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Weather extremes

How extreme does Itoigawa's weather get?

The hottest, coldest, wettest and snowiest days Itoigawa 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 Takada station 36 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 Itoigawa has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
105°F Aug 14, 2019

That is about 16°F hotter than a normal August afternoon in Itoigawa (typical high near 88°F).

The three most extreme on record

1 105°F Aug 14, 2019
2 103°F Aug 12, 1994
3 103°F Aug 14, 2023
❄️ Coldest night
18°F Feb 1, 2012

About 12°F colder than a normal February night in Itoigawa (typical low near 30°F).

The three most extreme on record

1 18°F Feb 1, 2012
2 18°F Jan 31, 2012
3 19°F Jan 25, 2009
🌧️ Most rain in one day
6.81 in Jul 1, 2017

About 83% of a typical July's rain in a single day (Itoigawa averages roughly 8.2 in across the month).

The three most extreme on record

1 6.81 in Jul 1, 2017
2 5.94 in Oct 23, 2017
3 5.79 in Sep 16, 1998

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 105°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Itoigawa's record heat sits well above even a hot day for the season — August's 105°F is about 16°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, Itoigawa'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 105°F and as low as 18°F. A single day has delivered over 7 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 Itoigawa, about 2 km from the city centre.

How we build these numbers →