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Has the climate in Hakone changed?
Hakone has warmed about 2.4°F between 1971 and 2020.
About 0.5°F per decade, measured from Hakone's official daily weather records, 1971–2020. Individual years still bounce around — some recent ones came in cool — but the long-term line has clearly risen.
What has actually changed
Each card compares the 1970s (the first ten years of the record) with recent years (the last ten) — the same span the headline and the chart use.
Hakone's temperature, year by year
Average temperature for each year from 1971 to 2020.
Each bar is one year. Most recent years sit above the older ones. Some recent years still came in cool — warming is a slope, not a straight climb.
In day-to-day terms, that long-term shift shows up as about 38 fewer freezing nights a year and about 4 more days above 90°F compared with the 1970s.
Methodology & sources
Temperature — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Gotemba, about 16 km from the city centre.