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Has the climate in Aizu-Wakamatsu changed?

Aizu-Wakamatsu has warmed about 2.5°F between 1971 and 2020.

About 0.5°F per decade, measured from Aizu-Wakamatsu'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? Aizu-Wakamatsu'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
56 fewer nights
1970s
118 / yr
Recent
62 / yr
Milder winters — fewer frosts
Average temperature
+1.9°F
1970s
52.1°F
Recent
54.0°F
A steady upward drift
Hot days above 90°F
3 more days
1970s
20 / yr
Recent
23 / yr
More days of serious heat
Rainy days
7 more days
1970s
160 / yr
Recent
167 / yr
Wetter on average

Aizu-Wakamatsu's temperature, year by year

Average temperature for each year from 1971 to 2020.

49°51°53°55°57°1971: 52.1°F1972: 54.0°F1973: 52.5°F1974: 51.4°F1975: 53.1°F1976: 50.9°F1977: 52.1°F1978: 52.6°F1979: 53.9°F1980: 51.4°F1981: 50.7°F1982: 52.4°F1983: 51.9°F1984: 51.2°F1985: 52.7°F1986: 51.6°F1987: 53.4°F1988: 51.5°F1989: 54.2°F1990: 55.2°F1991: 53.7°F1992: 52.9°F1993: 52.1°F1994: 54.5°F1995: 52.8°F1996: 52.2°F1997: 53.7°F1998: 54.6°F1999: 54.3°F2000: 53.6°F2001: 52.9°F2002: 53.7°F2003: 53.4°F2004: 54.3°F2006: 53.1°F2007: 53.9°F2008: 53.4°F2009: 53.6°F2010: 54.1°F2011: 52.9°F2012: 53.2°F2013: 53.4°F2014: 53.0°F2015: 54.7°F2016: 55.3°F2017: 53.2°F2018: 55.1°F2019: 55.1°F2020: 55.6°Flong-term trend197119801990200020102020
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 34 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 Wakamatsu, about 3 km from the city centre.

How we build these numbers →