Nagiso is located in the Kiso Valley of southwestern Nagano Prefecture, bordered by Gifu Prefecture to the west. The Kiso River flows through the center of the town.
The town has a climate characterized by characterized by hot and humid summers, and cold winters (Köppen climate classificationCfa). The average annual temperature in Nagiso is 11.5 °C (52.7 °F). The average annual rainfall is 2,381.2 mm (93.75 in) with July as the wettest month. The temperatures are highest on average in August, at around 23.5 °C (74.3 °F), and lowest in January, at around −0.6 °C (30.9 °F).[3]
Climate data for Nagiso (1991−2020 normals, extremes 1978−present)
The area of present-day Nagiso was part of ancient Shinano Province. During the Edo period, the area developed as series of post stations on the Nakasendō highway connecting Edo with Kyoto. The villages of Yomikaki, Tsumagoi and Tadachi merged to form the town of Nagiso on May 1, 1968.
Demographics
Per Japanese census data,[5] the population of Nagiso has remained declined rapidly over the past 60 years.
Historical population
Year
Pop.
±%
1940
8,551
—
1950
10,258
+20.0%
1960
10,771
+5.0%
1970
8,020
−25.5%
1980
6,680
−16.7%
1990
6,142
−8.1%
2000
5,687
−7.4%
2010
4,810
−15.4%
2020
3,915
−18.6%
Education
Nagiso has one public elementary schools and one public middle school operated by the town government, and one high school operated the Nagano Prefectural Board of Education.
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