From: Chronology of the 2015 eruption of Hakone volcano, Japan: geological background, mechanism of volcanic unrest and disaster mitigation measures during the crisis
Year
Observer
Max. temperature (°C)
1872
J. P. I. Vidal
103
1917
F. Omori
141
1920
T. Kato
106
1921
97
1925
S. Tokuda
98
1932–1933
M. Sugiyama and O. Okada
102
1951–1953
I. Iwasaki
86
1966–1967
K. Yuhara
138 (steam well?)