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Weather extremes
How extreme does Iwamizawa's weather get?
The hottest, coldest, wettest and snowiest days Iwamizawa has recorded — the outer limits of what its weather can do, and how far they sit beyond a normal day.
The four kinds of extreme
The hottest, coldest, wettest and snowiest single days Iwamizawa has recorded — each shown against what a normal day that time of year looks like.
That is about 19°F hotter than a normal July afternoon in Iwamizawa (typical high near 77°F).
The three most extreme on record
About 24°F colder than a normal February night in Iwamizawa (typical low near 15°F).
The three most extreme on record
About 77% of a typical August's rain in a single day (Iwamizawa averages roughly 6.3 in across the month).
The three most extreme on record
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.
Iwamizawa's record heat sits well above even a hot day for the season — July's 96°F is about 19°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
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Iwamizawa, about 2 km from the city centre.