Tome has warmed about 0.5°F between 1971 and 2020.
About 0.1°F per decade, measured from Tome'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.
Is that a lot? Tome's climate has warmed more slowly than most other cities in Japan.
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.
Freezing nights
48 fewer nights
1970s
101 / yr
→
Recent
53 / yr
Milder winters — fewer frosts
Average temperature
+0.5°F
1970s
53.3°F
→
Recent
53.8°F
A steady upward drift
Hot days above 90°F
2 more days
1970s
2 / yr
→
Recent
4 / yr
More days of serious heat
Rainy days
12 fewer days
1970s
110 / yr
→
Recent
98 / yr
Drier on average
Tome's temperature, year by year
Average temperature for each year from 1971 to 2020.
a warmer-than-average year a cooler-than-average year
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 30 fewer freezing nights a year compared with the 1970s.
Methodology & sources
Temperature — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Mono, about 18 km from the city centre.