Due to an "urban heat island" phenomenon, the summer temperature in Tokyo is very high in recent years. The graph below shows the changes in the average July temperature in Tokyo between 1875 and 2015. The July temperature is getting higher in the long-term.
Table: Average July temperature in Tokyo
| Year | ℃ | ℉ |
| 1875 | 26.0 | 78.8 |
| 1876 | 24.3 | 75.7 |
| 1877 | 26.5 | 79.7 |
| 1878 | 26.0 | 78.8 |
| 1879 | 26.1 | 79.0 |
| 1880 | 24.2 | 75.6 |
| 1881 | 24.0 | 75.2 |
| 1882 | 24.2 | 75.6 |
| 1883 | 23.7 | 74.7 |
| 1884 | 23.4 | 74.1 |
| 1885 | 23.1 | 73.6 |
| 1886 | 25.0 | 77.0 |
| 1887 | 23.6 | 74.5 |
| 1888 | 24.5 | 76.1 |
| 1889 | 23.4 | 74.1 |
| 1890 | 23.5 | 74.3 |
| 1891 | 24.9 | 76.8 |
| 1892 | 25.7 | 78.3 |
| 1893 | 25.3 | 77.5 |
| 1894 | 26.8 | 80.2 |
| 1895 | 22.1 | 71.8 |
| 1896 | 24.1 | 75.4 |
| 1897 | 22.9 | 73.2 |
| 1898 | 25.9 | 78.6 |
| 1899 | 23.2 | 73.8 |
| 1900 | 22.8 | 73.0 |
| 1901 | 22.1 | 71.8 |
| 1902 | 21.8 | 71.2 |
| 1903 | 23.2 | 73.8 |
| 1904 | 24.8 | 76.6 |
| 1905 | 23.3 | 73.9 |
| 1906 | 23.5 | 74.3 |
| 1907 | 22.7 | 72.9 |
| 1908 | 22.1 | 71.8 |
| 1909 | 24.3 | 75.7 |
| 1910 | 23.0 | 73.4 |
| 1911 | 24.5 | 76.1 |
| 1912 | 24.3 | 75.7 |
| 1913 | 23.3 | 73.9 |
| 1914 | 25.5 | 77.9 |
| 1915 | 24.2 | 75.6 |
| 1916 | 23.9 | 75.0 |
| 1917 | 25.7 | 78.3 |
| 1918 | 26.0 | 78.8 |
| 1919 | 23.6 | 74.5 |
| 1920 | 26.1 | 79.0 |
| 1921 | 24.3 | 75.7 |
| 1922 | 25.0 | 77.0 |
| 1923 | 24.0 | 75.2 |
| 1924 | 26.1 | 79.0 |
| 1925 | 23.2 | 73.8 |
| 1926 | 24.6 | 76.3 |
| 1927 | 26.0 | 78.8 |
| 1928 | 23.4 | 74.1 |
| 1929 | 25.9 | 78.6 |
| 1930 | 26.3 | 79.3 |
| 1931 | 21.8 | 71.2 |
| 1932 | 25.7 | 78.3 |
| 1933 | 26.6 | 79.9 |
| 1934 | 23.9 | 75.0 |
| 1935 | 24.3 | 75.7 |
| 1936 | 24.9 | 76.8 |
| 1937 | 26.3 | 79.3 |
| 1938 | 25.0 | 77.0 |
| 1939 | 26.5 | 79.7 |
| 1940 | 26.9 | 80.4 |
| 1941 | 23.7 | 74.7 |
| 1942 | 27.5 | 81.5 |
| 1943 | 25.1 | 77.2 |
| 1944 | 25.6 | 78.1 |
| 1945 | 22.0 | 71.6 |
| 1946 | 26.2 | 79.2 |
| 1947 | 25.7 | 78.3 |
| 1948 | 26.0 | 78.8 |
| 1949 | 25.3 | 77.5 |
| 1950 | 26.5 | 79.7 |
| 1951 | 24.3 | 75.7 |
| 1952 | 24.3 | 75.7 |
| 1953 | 24.7 | 76.5 |
| 1954 | 22.3 | 72.1 |
| 1955 | 27.6 | 81.7 |
| 1956 | 24.2 | 75.6 |
| 1957 | 24.4 | 75.9 |
| 1958 | 24.9 | 76.8 |
| 1959 | 26.1 | 79.0 |
| 1960 | 25.8 | 78.4 |
| 1961 | 27.4 | 81.3 |
| 1962 | 25.1 | 77.2 |
| 1963 | 25.7 | 78.3 |
| 1964 | 25.5 | 77.9 |
| 1965 | 24.2 | 75.6 |
| 1966 | 24.4 | 75.9 |
| 1967 | 26.3 | 79.3 |
| 1968 | 24.7 | 76.5 |
| 1969 | 25.0 | 77.0 |
| 1970 | 25.4 | 77.7 |
| 1971 | 25.8 | 78.4 |
| 1972 | 25.2 | 77.4 |
| 1973 | 26.1 | 79.0 |
| 1974 | 23.4 | 74.1 |
| 1975 | 25.6 | 78.1 |
| 1976 | 23.9 | 75.0 |
| 1977 | 25.8 | 78.4 |
| 1978 | 27.8 | 82.0 |
| 1979 | 25.2 | 77.4 |
| 1980 | 23.8 | 74.8 |
| 1981 | 26.3 | 79.3 |
| 1982 | 23.1 | 73.6 |
| 1983 | 23.8 | 74.8 |
| 1984 | 26.2 | 79.2 |
| 1985 | 26.3 | 79.3 |
| 1986 | 23.9 | 75.0 |
| 1987 | 27.0 | 80.6 |
| 1988 | 22.4 | 72.3 |
| 1989 | 24.1 | 75.4 |
| 1990 | 25.7 | 78.3 |
| 1991 | 26.7 | 80.1 |
| 1992 | 25.5 | 77.9 |
| 1993 | 22.5 | 72.5 |
| 1994 | 28.3 | 82.9 |
| 1995 | 26.4 | 79.5 |
| 1996 | 26.2 | 79.2 |
| 1997 | 26.6 | 79.9 |
| 1998 | 25.3 | 77.5 |
| 1999 | 25.9 | 78.6 |
| 2000 | 27.7 | 81.9 |
| 2001 | 28.5 | 83.3 |
| 2002 | 28.0 | 82.4 |
| 2003 | 22.8 | 73.0 |
| 2004 | 28.5 | 83.3 |
| 2005 | 25.6 | 78.1 |
| 2006 | 25.6 | 78.1 |
| 2007 | 24.4 | 75.9 |
| 2008 | 27.0 | 80.6 |
| 2009 | 26.3 | 79.3 |
| 2010 | 28.0 | 82.4 |
| 2011 | 27.3 | 81.1 |
| 2012 | 26.4 | 79.5 |
| 2013 | 27.3 | 81.1 |
| 2014 | 26.8 | 80.2 |
| 2015 | 26.2 | 79.2 |
Source is Japan Meteorological Agency.
www.data.jma.go.jp/obd/stats/etrn/view/monthly_s3.php?prec_no=44&block_no=47662
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