U.S. Climate Extremes Index (CEI)

Graph

Choose a period/season and an indicator from the options below and click "Plot" to create a time series graph. Note that the sixth indicator (Step 6) is not calculated for the spring (March-May), winter (December-February) and cold (October-March) seasons since most months during these periods are outside of the traditional hurricane season.



Move mouse towards an axis until highlighted. Left-click mouse to pan. Shift key + left-click to zoom.

Year Percent
1910 7.80%
1911 14.40%
1912 5.80%
1913 7.00%
1914 17.00%
1915 13.30%
1916 8.00%
1917 2.40%
1918 8.00%
1919 8.10%
1920 7.90%
1921 14.30%
1922 6.70%
1923 10.10%
1924 2.50%
1925 7.60%
1926 3.40%
1927 7.70%
1928 7.70%
1929 6.90%
1930 7.60%
1931 6.70%
1932 5.40%
1933 18.90%
1934 8.80%
1935 13.30%
1936 14.20%
1937 1.10%
1938 18.00%
1939 4.20%
1940 6.70%
1941 13.40%
1942 13.20%
1943 5.50%
1944 2.20%
1945 11.20%
1946 11.20%
1947 2.80%
1948 7.90%
1949 8.10%
1950 10.80%
1951 9.70%
1952 7.80%
1953 13.20%
1954 9.90%
1955 7.40%
1956 2.20%
1957 13.20%
1958 6.50%
1959 6.60%
1960 5.50%
1961 14.30%
1962 8.50%
1963 8.80%
1964 12.30%
1965 16.20%
1966 13.60%
1967 12.10%
1968 7.50%
1969 7.40%
1970 2.20%
1971 8.60%
1972 6.40%
1973 17.90%
1974 16.50%
1975 6.60%
1976 7.30%
1977 7.40%
1978 7.70%
1979 14.50%
1980 14.80%
1981 10.10%
1982 6.80%
1983 12.30%
1984 5.60%
1985 21.10%
1986 15.10%
1987 6.60%
1988 7.40%
1989 8.80%
1990 12.10%
1991 17.90%
1992 2.40%
1993 5.60%
1994 9.00%
1995 21.60%
1996 21.60%
1997 12.70%
1998 30.50%
1999 13.40%
2000 5.70%
2001 17.80%
2002 15.10%
2003 9.70%
2004 5.70%
2005 13.90%
2006 16.10%
2007 19.70%
2008 22.70%
2009 19.00%
2010 17.30%
2011 14.70%
2012 13.00%

*As of September 2005, the fourth and fifth indicators are computed with data from one station per each grid box rather than multiple stations. This was done to eliminate many of the artificial extremes which resulted from a changing number of available stations over time. Therefore, the percentages in the step 4 and 5 graphs above will likely be significantly different from the percentages calculated prior to the changes implemented in September 2005.

View CEI Data Files

Limitations: Statistics for the most recent period/season are computed from a fraction of the U.S. which has data available at that time. Extreme percentage values can and will likely change as final quality controlled data become available and fill in the data gaps.