Weather by Month (1930) : Statistical Yearbook of Imperial Japan 50 (1931) Table 7

PERIOD: Average observations at each meteorological station from its establishment to 1930, annual average for 1930, and monthly average for January, April, July, and October of 1930. SOURCE: [Reports by the Central Meteorological Observatory of Japan].

观测周期：自设立至1930年期间的各气象站平均观测数据，1930年的年度平均值，以及1930年1月、4月、7月和10月的月度平均值。来源：[日本中央气象观测所报告]。