Aomori has warmed about 2.9°F between 1971 and 2020.
About 0.6°F per decade, measured from Aomori'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? Aomori's warming is broadly in line with other cities in Japan — neither unusually fast nor unusually slow.
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
65 fewer nights
1970s
124 / yr
→
Recent
59 / yr
Milder winters — fewer frosts
Average temperature
+2.2°F
1970s
49.5°F
→
Recent
51.7°F
A steady upward drift
Hot days above 90°F
1 more day
1970s
5 / yr
→
Recent
6 / yr
More days of serious heat
Rainy days
9 fewer days
1970s
187 / yr
→
Recent
178 / yr
Drier on average
Aomori'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 40 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 Aomori, about 3 km from the city centre.