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 9.60%
1911 13.60%
1912 12.70%
1913 11.40%
1914 18.00%
1915 9.80%
1916 13.60%
1917 5.70%
1918 8.00%
1919 8.10%
1920 10.00%
1921 8.30%
1922 13.30%
1923 9.30%
1924 4.30%
1925 6.40%
1926 10.90%
1927 10.20%
1928 7.00%
1929 10.60%
1930 5.60%
1931 5.40%
1932 6.20%
1933 7.00%
1934 9.40%
1935 7.90%
1936 11.20%
1937 10.70%
1938 11.60%
1939 7.70%
1940 11.10%
1941 5.80%
1942 10.90%
1943 10.30%
1944 8.60%
1945 7.30%
1946 8.60%
1947 7.30%
1948 9.80%
1949 5.50%
1950 8.60%
1951 9.50%
1952 8.10%
1953 9.50%
1954 17.50%
1955 5.30%
1956 6.10%
1957 7.70%
1958 6.00%
1959 8.50%
1960 5.10%
1961 8.90%
1962 8.00%
1963 8.10%
1964 15.80%
1965 8.30%
1966 7.70%
1967 10.60%
1968 9.00%
1969 11.90%
1970 14.80%
1971 7.20%
1972 11.60%
1973 11.40%
1974 13.00%
1975 4.50%
1976 7.30%
1977 8.20%
1978 7.40%
1979 9.30%
1980 11.50%
1981 9.40%
1982 7.50%
1983 11.50%
1984 10.10%
1985 9.50%
1986 10.60%
1987 8.00%
1988 5.30%
1989 7.60%
1990 13.10%
1991 14.20%
1992 7.50%
1993 9.70%
1994 9.00%
1995 11.10%
1996 18.50%
1997 15.00%
1998 16.00%
1999 13.10%
2000 12.70%
2001 12.10%
2002 11.70%
2003 7.60%
2004 10.30%
2005 12.90%
2006 12.00%
2007 16.00%
2008 19.80%
2009 12.50%
2010 13.90%
2011 14.10%
2012 13.20%
2013 16.00%

*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.