Here is a list of seasons and their ACE from 1870 to 2009 and ACE per a storm.
Code: Select all
1870 11 10 2 88 8 0.909091 0.181818
1871 8 6 2 88 11 0.75 0.25
1872 5 4 0 65 13 0.8 0
1873 5 3 2 69 13.8 0.6 0.4
1874 7 4 0 47 6.714286 0.571429 0
1875 6 5 1 72 12 0.833333 0.166667
1876 5 4 2 57 11.4 0.8 0.4
1877 8 3 1 73 9.125 0.375 0.125
1878 12 10 2 181 15.083333 0.833333 0.166667
1879 8 6 2 64 8 0.75 0.25
1880 11 9 2 131 11.909091 0.818182 0.181818
1881 7 4 0 59 8.428571 0.571429 0
1882 6 5 2 63 10.5 0.833333 0.333333
1883 4 3 2 67 16.75 0.75 0.5
1884 4 4 1 72 18 1 0.25
1885 8 6 1 58 7.25 0.75 0.125
1886 12 10 4 166 13.833333 0.833333 0.333333
1887 19 11 2 182 9.578947 0.578947 0.105263
1888 9 6 2 85 9.444444 0.666667 0.222222
1889 9 6 0 104 11.555556 0.666667 0
1890 4 2 1 33 8.25 0.5 0.25
1891 10 7 1 116 11.6 0.7 0.1
1892 9 5 0 116 12.888889 0.555556 0
1893 12 10 5 231 19.25 0.833333 0.416667
1894 7 5 4 135 19.285714 0.714286 0.571429
1895 6 2 0 69 11.5 0.333333 0
1896 7 6 2 136 19.428571 0.857143 0.285714
1897 6 3 0 55 9.166667 0.5 0
1898 11 5 1 113 10.272727 0.454545 0.090909
1899 9 5 2 150 16.666667 0.555556 0.222222
1900 7 3 2 84 12 0.428571 0.285714
1901 12 5 0 93 7.75 0.416667 0
1902 5 3 0 33 6.6 0.6 0
1903 10 7 1 102 10.2 0.7 0.1
1904 5 3 0 25 5 0.6 0
1905 5 1 1 28 5.6 0.2 0.2
1906 11 6 3 163 14.818182 0.545455 0.272727
1907 5 0 0 13 2.6 0 0
1908 10 6 1 95 9.5 0.6 0.1
1909 11 6 4 92 8.363636 0.545455 0.363636
1910 5 3 1 64 12.8 0.6 0.2
1911 6 3 0 35 5.833333 0.5 0
1912 7 4 1 56 8 0.571429 0.142857
1913 6 4 0 36 6 0.666667 0
1914 1 0 0 3 3 0 0
1915 6 5 3 127 21.166667 0.833333 0.5
1916 15 10 5 144 9.6 0.666667 0.333333
1917 4 2 2 61 15.25 0.5 0.5
1918 6 4 1 40 6.666667 0.666667 0.166667
1919 5 2 1 55 11 0.4 0.2
1920 5 4 0 30 6 0.8 0
1921 7 5 2 87 12.428571 0.714286 0.285714
1922 5 3 1 55 11 0.6 0.2
1923 9 4 1 49 5.444444 0.444444 0.111111
1924 11 5 2 100 9.090909 0.454545 0.181818
1925 4 2 0 7 1.75 0.5 0
1926 11 8 6 222 20.181818 0.727273 0.545455
1927 7 4 2 56 8 0.571429 0.285714
1928 6 4 1 75 12.5 0.666667 0.166667
1929 3 3 1 43 14.333333 1 0.333333
1930 2 2 1 39 19.5 1 0.5
1931 9 2 1 39 4.333333 0.222222 0.111111
1932 11 6 4 136 12.363636 0.545455 0.363636
1933 21 10 5 213 10.142857 0.47619 0.238095
1934 11 6 0 60 5.454545 0.545455 0
1935 6 5 3 95 15.833333 0.833333 0.5
1936 16 7 1 108 6.75 0.4375 0.0625
1937 9 3 0 61 6.777778 0.333333 0
1938 8 3 1 73 9.125 0.375 0.125
1939 5 3 1 34 6.8 0.6 0.2
1940 8 4 0 52 6.5 0.5 0
1941 6 4 2 61 10.166667 0.666667 0.333333
1942 10 4 1 66 6.6 0.4 0.1
1943 10 5 2 94 9.4 0.5 0.2
1944 11 7 3 96 8.727273 0.636364 0.272727
1945 11 5 3 67 6.090909 0.454545 0.272727
1946 6 3 1 22 3.666667 0.5 0.166667
1947 9 5 2 112 12.444444 0.555556 0.222222
1948 9 6 4 106 11.777778 0.666667 0.444444
1949 13 7 3 98 7.538462 0.538462 0.230769
1950 13 11 8 243 18.692308 0.846154 0.615385
1951 10 8 5 137 13.7 0.8 0.5
1952 7 6 3 87 12.428571 0.857143 0.428571
1953 14 6 4 104 7.428571 0.428571 0.285714
1954 11 8 2 113 10.272727 0.727273 0.181818
1955 12 9 6 199 16.583333 0.75 0.5
1956 8 4 2 54 6.75 0.5 0.25
1957 8 3 2 84 10.5 0.375 0.25
1958 10 7 5 121 12.1 0.7 0.5
1959 11 7 2 77 7 0.636364 0.181818
1960 7 4 2 88 12.571429 0.571429 0.285714
1961 11 8 7 205 18.636364 0.727273 0.636364
1962 5 3 1 36 7.2 0.6 0.2
1963 9 7 2 118 13.111111 0.777778 0.222222
1964 12 6 6 170 14.166667 0.5 0.5
1965 6 4 1 84 14 0.666667 0.166667
1966 11 7 3 145 13.181818 0.636364 0.272727
1967 8 6 1 122 15.25 0.75 0.125
1968 8 4 0 35 4.375 0.5 0
1969 18 12 5 158 8.777778 0.666667 0.277778
1970 10 5 2 34 3.4 0.5 0.2
1971 13 6 1 97 7.461538 0.461538 0.076923
1972 7 3 0 28 4 0.428571 0
1973 8 4 1 43 5.375 0.5 0.125
1974 11 4 2 61 5.545455 0.363636 0.181818
1975 9 6 3 73 8.111111 0.666667 0.333333
1976 10 6 2 81 8.1 0.6 0.2
1977 6 5 1 25 4.166667 0.833333 0.166667
1978 12 5 2 62 5.166667 0.416667 0.166667
1979 9 5 2 91 10.111111 0.555556 0.222222
1980 11 9 2 147 13.363636 0.818182 0.181818
1981 12 7 3 93 7.75 0.583333 0.25
1982 6 2 1 29 4.833333 0.333333 0.166667
1983 4 3 1 17 4.25 0.75 0.25
1984 13 5 1 71 5.461538 0.384615 0.076923
1985 11 7 3 88 8 0.636364 0.272727
1986 6 4 0 36 6 0.666667 0
1987 7 3 1 34 4.857143 0.428571 0.142857
1988 12 5 3 103 8.583333 0.416667 0.25
1989 11 7 2 135 12.272727 0.636364 0.181818
1990 14 8 1 91 6.5 0.571429 0.071429
1991 8 4 2 34 4.25 0.5 0.25
1992 7 4 1 75 10.714286 0.571429 0.142857
1993 8 4 1 39 4.875 0.5 0.125
1994 7 3 0 32 4.571429 0.428571 0
1995 19 11 5 227 11.947368 0.578947 0.263158
1996 13 9 6 166 12.769231 0.692308 0.461538
1997 8 3 1 40 5 0.375 0.125
1998 14 10 3 182 13 0.714286 0.214286
1999 12 8 5 177 14.75 0.666667 0.416667
2000 15 8 3 116 7.733333 0.533333 0.2
2001 15 9 4 106 7.066667 0.6 0.266667
2002 12 4 2 66 5.5 0.333333 0.166667
2003 16 7 3 175 10.9375 0.4375 0.1875
2004 15 9 6 224 14.933333 0.6 0.4
2005 28 15 7 248 8.857143 0.535714 0.25
2006 10 5 2 78 7.8 0.5 0.2
2007 15 6 2 72 4.8 0.4 0.133333
2008 16 8 5 144 9 0.5 0.3125
2009 9 3 2 51 5.666667 0.333333 0.222222
http://www.aoml.noaa.gov/hrd/tcfaq/E11.html
Sorry for any formatting error. Here is how the list is organized.
Year Number of Storms Forming Hurricanes Major Hurricanes ACE ACE Per A Storm Percentage Form To Hurricane Percentage Form To Major Hurricane
ACE Per A Storm Statistics
Average
9.78
Median
9.125
Standard Deviation
4.232329
Least
1.75 (1925)
Most
21.166667 (1915)
5th Percentile
4.245833
25th Percentile
6.6
50th Percentile
9.125
75th Percentile
12.458333
95th Percentile
18.639161
Seasons with below, average, or slightly above average storms forming that had high ACEs had many hurricanes and major hurricanes form, like we see in 1950, 1961, and 1999. This leads to the percentage of how many hurricanes and major hurricanes form per a season.
Percentage of Hurricanes Forming
Average
0.588353
Median
0.578947
Standard Deviation
0.174957
5th Percentile
0.333333
25th Percentile
0.5
50th Percentile
0.578947
75th Percentile
0.703571
95th Percentile
0.833974
Least
0 (1907, 1914)
Most
1 (1884, 1929, and 1930)
Percentage of Major Hurricanes Forming
Average
0.214143
Median
0.2
Standard Deviation
0.152141
5th Percentile
0
25th Percentile
0.121528
50th Percentile
0.2
75th Percentile
0.285714
95th Percentile
0.5
Least
0 (Many, most recent is 1994)
Most
0.636364 (1961)
Please keep in mind that any hurricane data before 1950s should be treated as dubious because there were no satellites back then.
What does it mean? Quantity is not everything. 2007 had 15 storms form, yet the ACE was 72, which is 4.8 per a storm right there. 1961 had 11 storms form and had an ACE of 205, 18.6 ACE per a storm. Same goes with 1998, 1999, and 2004. 2005 had 28 storms form, yet had an 8.8 ACE per a storm.
Also, some of the most active season in terms of ACE had many long tracking hurricanes from the Cape Verde Islands. Also, they had many hurricanes and major hurricanes form. Also, percentage of hurricanes and major hurricanes is higher, like in 1961, 1998, 1999, and 2004.