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 9.10%
1911 15.00%
1912 11.10%
1913 7.70%
1914 15.80%
1915 14.00%
1916 10.70%
1917 4.80%
1918 7.70%
1919 12.20%
1920 8.50%
1921 10.90%
1922 10.40%
1923 12.40%
1924 8.40%
1925 5.00%
1926 10.70%
1927 9.30%
1928 7.80%
1929 8.10%
1930 5.40%
1931 6.10%
1932 7.60%
1933 12.90%
1934 7.00%
1935 7.10%
1936 11.20%
1937 12.90%
1938 12.30%
1939 5.50%
1940 7.20%
1941 10.00%
1942 9.60%
1943 6.40%
1944 7.40%
1945 6.00%
1946 8.90%
1947 7.00%
1948 9.00%
1949 4.90%
1950 11.70%
1951 8.90%
1952 8.50%
1953 11.30%
1954 10.00%
1955 11.10%
1956 5.20%
1957 8.10%
1958 6.40%
1959 9.00%
1960 7.40%
1961 10.80%
1962 10.20%
1963 4.30%
1964 13.50%
1965 10.30%
1966 13.00%
1967 7.30%
1968 8.90%
1969 9.00%
1970 8.40%
1971 7.40%
1972 9.20%
1973 10.30%
1974 9.10%
1975 7.30%
1976 6.90%
1977 10.00%
1978 7.30%
1979 9.40%
1980 13.50%
1981 12.40%
1982 14.10%
1983 10.80%
1984 8.40%
1985 10.10%
1986 12.60%
1987 9.10%
1988 8.70%
1989 9.30%
1990 15.10%
1991 12.90%
1992 5.40%
1993 11.60%
1994 11.00%
1995 16.40%
1996 21.10%
1997 13.60%
1998 22.00%
1999 15.20%
2000 10.20%
2001 11.50%
2002 12.90%
2003 10.30%
2004 12.60%
2005 19.30%
2006 16.40%
2007 20.10%
2008 20.30%
2009 11.30%
2010 21.30%
2011 14.60%
2012 12.20%

*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.