According to Japan Meteorological Agency, there were average 48.5 days in which the highest temperature exceeded 30 degrees C (86 F). It was the average number in last two decades. The following table shows the detail.
There were 71 "tropical days" in 2010, and it is the record of the largest number.
Table: Number of Days Over 30 degrees C (86 F) in Tokyo
| May | June | July | August | September | October | Days Total | |
| 1876 | 0 | 0 | 13 | 25 | 11 | 0 | 49 |
| 1877 | 0 | 3 | 25 | 22 | 2 | 0 | 52 |
| 1878 | 0 | 0 | 18 | 11 | 3 | 0 | 32 |
| 1879 | 0 | 0 | 20 | 26 | 0 | 0 | 46 |
| 1880 | 0 | 0 | 7 | 18 | 3 | 0 | 28 |
| 1881 | 0 | 2 | 6 | 26 | 11 | 0 | 45 |
| 1882 | 0 | 0 | 10 | 7 | 0 | 0 | 17 |
| 1883 | 0 | 0 | 11 | 13 | 4 | 0 | 28 |
| 1884 | 0 | 0 | 5 | 7 | 3 | 0 | 15 |
| 1885 | 0 | 1 | 2 | 8 | 4 | 0 | 15 |
| 1886 | 0 | 1 | 11 | 23 | 3 | 0 | 38 |
| 1887 | 0 | 0 | 3 | 11 | 2 | 0 | 16 |
| 1888 | 0 | 0 | 9 | 17 | 2 | 0 | 28 |
| 1889 | 0 | 3 | 4 | 22 | 0 | 0 | 29 |
| 1890 | 0 | 2 | 8 | 7 | 5 | 0 | 22 |
| 1891 | 0 | 0 | 7 | 14 | 14 | 0 | 35 |
| 1892 | 0 | 0 | 16 | 21 | 15 | 0 | 52 |
| 1893 | 0 | 1 | 21 | 20 | 8 | 0 | 50 |
| 1894 | 0 | 10 | 27 | 25 | 2 | 0 | 64 |
| 1895 | 0 | 1 | 3 | 18 | 9 | 0 | 31 |
| 1896 | 0 | 2 | 10 | 22 | 6 | 0 | 40 |
| 1897 | 0 | 0 | 6 | 15 | 7 | 0 | 28 |
| 1898 | 0 | 1 | 18 | 22 | 4 | 0 | 45 |
| 1899 | 0 | 2 | 0 | 21 | 0 | 0 | 23 |
| 1900 | 0 | 0 | 4 | 20 | 9 | 0 | 33 |
| 1901 | 0 | 1 | 7 | 19 | 3 | 0 | 30 |
| 1902 | 0 | 0 | 2 | 7 | 0 | 0 | 9 |
| 1903 | 0 | 0 | 5 | 21 | 9 | 0 | 35 |
| 1904 | 0 | 1 | 10 | 20 | 3 | 0 | 34 |
| 1905 | 0 | 0 | 6 | 6 | 6 | 0 | 18 |
| 1906 | 0 | 0 | 10 | 14 | 0 | 0 | 24 |
| 1907 | 0 | 0 | 4 | 20 | 3 | 0 | 27 |
| 1908 | 0 | 2 | 6 | 18 | 0 | 0 | 26 |
| 1909 | 0 | 0 | 17 | 17 | 5 | 0 | 39 |
| 1910 | 0 | 1 | 2 | 10 | 6 | 0 | 19 |
| 1911 | 0 | 1 | 11 | 15 | 5 | 0 | 32 |
| 1912 | 0 | 0 | 13 | 21 | 1 | 0 | 35 |
| 1913 | 0 | 1 | 9 | 12 | 0 | 0 | 22 |
| 1914 | 0 | 2 | 19 | 24 | 9 | 0 | 54 |
| 1915 | 0 | 2 | 16 | 15 | 6 | 2 | 41 |
| 1916 | 0 | 3 | 10 | 15 | 15 | 0 | 43 |
| 1917 | 0 | 4 | 18 | 15 | 3 | 1 | 41 |
| 1918 | 0 | 1 | 19 | 21 | 9 | 0 | 50 |
| 1919 | 0 | 1 | 5 | 17 | 9 | 0 | 32 |
| 1920 | 0 | 0 | 22 | 13 | 3 | 0 | 38 |
| 1921 | 0 | 0 | 9 | 19 | 1 | 0 | 29 |
| 1922 | 0 | 1 | 11 | 28 | 13 | 0 | 53 |
| 1923 | 0 | 0 | 12 | 26 | 10 | 0 | 48 |
| 1924 | 0 | 1 | 23 | 20 | 5 | 0 | 49 |
| 1925 | 0 | 0 | 8 | 17 | 3 | 1 | 29 |
| 1926 | 0 | 1 | 12 | 19 | 8 | 0 | 40 |
| 1927 | 0 | 1 | 19 | 27 | 4 | 0 | 51 |
| 1928 | 0 | 0 | 4 | 5 | 14 | 0 | 23 |
| 1929 | 0 | 1 | 19 | 26 | 3 | 0 | 49 |
| 1930 | 0 | 0 | 16 | 22 | 5 | 0 | 43 |
| 1931 | 0 | 0 | 2 | 21 | 4 | 0 | 27 |
| 1932 | 0 | 0 | 14 | 20 | 4 | 0 | 38 |
| 1933 | 0 | 1 | 19 | 28 | 12 | 0 | 60 |
| 1934 | 0 | 2 | 11 | 22 | 0 | 0 | 35 |
| 1935 | 0 | 1 | 8 | 13 | 3 | 0 | 25 |
| 1936 | 0 | 2 | 16 | 19 | 14 | 0 | 51 |
| 1937 | 0 | 0 | 16 | 30 | 6 | 0 | 52 |
| 1938 | 0 | 2 | 14 | 15 | 1 | 1 | 33 |
| 1939 | 0 | 0 | 20 | 17 | 5 | 0 | 42 |
| 1940 | 1 | 1 | 24 | 17 | 8 | 0 | 51 |
| 1941 | 0 | 1 | 14 | 13 | 2 | 0 | 30 |
| 1942 | 0 | 2 | 24 | 21 | 12 | 0 | 59 |
| 1943 | 1 | 0 | 17 | 29 | 8 | 0 | 55 |
| 1944 | 1 | 4 | 15 | 27 | 7 | 0 | 54 |
| 1945 | 0 | 2 | 1 | 23 | 2 | 0 | 28 |
| 1946 | 0 | 9 | 19 | 24 | 11 | 0 | 63 |
| 1947 | 0 | 0 | 24 | 28 | 4 | 0 | 56 |
| 1948 | 0 | 2 | 23 | 18 | 11 | 0 | 54 |
| 1949 | 0 | 1 | 15 | 25 | 4 | 0 | 45 |
| 1950 | 0 | 4 | 24 | 22 | 15 | 0 | 65 |
| 1951 | 0 | 2 | 14 | 24 | 2 | 0 | 42 |
| 1952 | 0 | 2 | 10 | 23 | 6 | 0 | 41 |
| 1953 | 0 | 1 | 10 | 16 | 2 | 0 | 29 |
| 1954 | 0 | 0 | 5 | 25 | 11 | 0 | 41 |
| 1955 | 0 | 6 | 28 | 17 | 6 | 0 | 57 |
| 1956 | 1 | 5 | 10 | 15 | 9 | 0 | 40 |
| 1957 | 0 | 0 | 6 | 25 | 1 | 0 | 32 |
| 1958 | 1 | 7 | 8 | 19 | 7 | 0 | 42 |
| 1959 | 1 | 0 | 18 | 20 | 9 | 0 | 48 |
| 1960 | 0 | 3 | 17 | 19 | 7 | 0 | 46 |
| 1961 | 1 | 1 | 25 | 23 | 16 | 0 | 66 |
| 1962 | 0 | 0 | 14 | 26 | 18 | 0 | 58 |
| 1963 | 2 | 7 | 18 | 21 | 3 | 0 | 51 |
| 1964 | 1 | 2 | 16 | 26 | 7 | 0 | 52 |
| 1965 | 0 | 3 | 7 | 19 | 0 | 0 | 29 |
| 1966 | 0 | 3 | 10 | 19 | 7 | 0 | 39 |
| 1967 | 1 | 1 | 20 | 26 | 4 | 0 | 52 |
| 1968 | 0 | 1 | 9 | 22 | 0 | 0 | 32 |
| 1969 | 1 | 0 | 18 | 27 | 6 | 0 | 52 |
| 1970 | 1 | 1 | 15 | 25 | 9 | 0 | 51 |
| 1971 | 0 | 1 | 17 | 21 | 2 | 0 | 41 |
| 1972 | 0 | 2 | 13 | 20 | 5 | 0 | 40 |
| 1973 | 0 | 0 | 18 | 29 | 5 | 0 | 52 |
| 1974 | 0 | 0 | 10 | 25 | 4 | 0 | 39 |
| 1975 | 0 | 0 | 17 | 24 | 21 | 0 | 62 |
| 1976 | 0 | 0 | 13 | 15 | 3 | 0 | 31 |
| 1977 | 1 | 0 | 17 | 13 | 10 | 0 | 41 |
| 1978 | 0 | 6 | 26 | 29 | 2 | 0 | 63 |
| 1979 | 0 | 10 | 12 | 23 | 7 | 1 | 53 |
| 1980 | 0 | 4 | 7 | 5 | 5 | 0 | 21 |
| 1981 | 0 | 1 | 19 | 16 | 5 | 0 | 41 |
| 1982 | 0 | 0 | 2 | 19 | 3 | 0 | 24 |
| 1983 | 0 | 0 | 8 | 19 | 8 | 0 | 35 |
| 1984 | 0 | 1 | 17 | 27 | 5 | 1 | 51 |
| 1985 | 0 | 1 | 19 | 27 | 7 | 0 | 54 |
| 1986 | 0 | 1 | 7 | 20 | 5 | 0 | 33 |
| 1987 | 0 | 4 | 19 | 21 | 6 | 0 | 50 |
| 1988 | 0 | 0 | 2 | 18 | 1 | 0 | 21 |
| 1989 | 0 | 1 | 10 | 23 | 13 | 0 | 47 |
| 1990 | 0 | 4 | 17 | 27 | 12 | 0 | 60 |
| 1991 | 0 | 8 | 16 | 13 | 8 | 0 | 45 |
| 1992 | 0 | 0 | 16 | 23 | 7 | 0 | 46 |
| 1993 | 1 | 2 | 5 | 10 | 1 | 0 | 19 |
| 1994 | 0 | 1 | 25 | 27 | 13 | 0 | 66 |
| 1995 | 0 | 0 | 14 | 29 | 7 | 0 | 50 |
| 1996 | 1 | 4 | 21 | 18 | 2 | 0 | 46 |
| 1997 | 0 | 6 | 22 | 23 | 7 | 0 | 58 |
| 1998 | 0 | 4 | 14 | 22 | 7 | 1 | 48 |
| 1999 | 1 | 2 | 17 | 28 | 15 | 0 | 63 |
| 2000 | 1 | 3 | 24 | 29 | 10 | 0 | 67 |
| 2001 | 0 | 6 | 27 | 16 | 3 | 0 | 52 |
| 2002 | 0 | 4 | 24 | 25 | 6 | 0 | 59 |
| 2003 | 0 | 4 | 3 | 17 | 14 | 0 | 38 |
| 2004 | 3 | 8 | 26 | 21 | 12 | 0 | 70 |
| 2005 | 0 | 5 | 14 | 25 | 12 | 1 | 57 |
| 2006 | 0 | 2 | 10 | 20 | 6 | 0 | 38 |
| 2007 | 0 | 8 | 8 | 27 | 12 | 0 | 55 |
| 2008 | 0 | 0 | 23 | 20 | 10 | 0 | 53 |
| 2009 | 0 | 2 | 14 | 21 | 1 | 0 | 38 |
| 2010 | 1 | 4 | 22 | 30 | 14 | 0 | 71 |
| 2011 | 0 | 6 | 20 | 21 | 14 | 0 | 61 |
| 2012 | 0 | 1 | 17 | 29 | 18 | 1 | 66 |
| 2013 | 0 | 1 | 19 | 28 | 8 | 2 | 58 |
| Average | 0.3 | 2.9 | 15.5 | 22 | 7.7 | 0.1 | 48.5 |
Source is Japan Meteorological Agency.
www.jma-net.go.jp/tokyo/sub_index/kiroku/kiroku/data/41.htm
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