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Weather extremes
How extreme does Annaka's weather get?
The hottest, coldest, wettest and snowiest days Annaka has recorded — the outer limits of what its weather can do, and how far they sit beyond a normal day.
Based on 16 years of daily weather observations (2009–present), from the Somagahara (Jgsdf) Helipad 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 Annaka has recorded — each shown against what a normal day that time of year looks like.
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Hottest day
100°F
Jul 21, 2010
The three most extreme on record
1
100°F
Jul 21, 2010
2
100°F
Aug 5, 2025
3
99°F
Aug 11, 2020
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Coldest night
16°F
Feb 2, 2012
The three most extreme on record
1
16°F
Feb 2, 2012
2
18°F
Feb 3, 2010
3
18°F
Jan 9, 2014
In plain terms
Across the record, Annaka has reached as high as 100°F and as low as 16°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 Kamisatomi, about 5 km from the city centre.