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.

Download: Wet Data | Dry Data
Year Wet Dry
1910 0.00% 31.40%
1911 7.30% 7.50%
1912 7.80% 15.80%
1913 3.90% 12.30%
1914 0.00% 27.00%
1915 22.70% 2.10%
1916 3.80% 13.70%
1917 0.00% 24.10%
1918 0.00% 16.30%
1919 0.00% 9.60%
1920 0.00% 20.20%
1921 1.90% 0.00%
1922 0.00% 18.10%
1923 7.40% 3.50%
1924 11.10% 3.70%
1925 0.00% 13.40%
1926 33.00% 1.90%
1927 18.20% 0.00%
1928 1.80% 3.70%
1929 25.90% 0.00%
1930 0.00% 30.20%
1931 1.80% 9.20%
1932 0.00% 11.00%
1933 1.80% 8.90%
1934 0.00% 30.40%
1935 10.90% 0.00%
1936 0.00% 46.00%
1937 13.10% 3.70%
1938 6.90% 10.80%
1939 3.60% 14.20%
1940 3.50% 5.40%
1941 8.70% 16.10%
1942 17.60% 3.50%
1943 7.00% 10.70%
1944 3.50% 7.20%
1945 40.70% 0.00%
1946 0.00% 7.50%
1947 1.90% 1.80%
1948 3.70% 1.80%
1949 10.90% 0.00%
1950 21.60% 3.60%
1951 34.70% 0.00%
1952 0.00% 13.00%
1953 0.00% 36.50%
1954 1.80% 12.70%
1955 0.00% 16.50%
1956 7.10% 17.70%
1957 18.50% 0.00%
1958 1.90% 9.30%
1959 1.80% 3.70%
1960 1.90% 9.40%
1961 7.30% 1.80%
1962 3.70% 10.80%
1963 0.00% 54.10%
1964 1.80% 14.30%
1965 1.80% 3.80%
1966 0.00% 16.10%
1967 10.60% 1.80%
1968 3.70% 1.80%
1969 1.90% 1.80%
1970 9.00% 3.70%
1971 0.00% 18.00%
1972 33.30% 5.60%
1973 39.80% 0.00%
1974 26.40% 3.70%
1975 22.60% 1.90%
1976 0.00% 35.00%
1977 14.50% 1.80%
1978 5.80% 0.00%
1979 25.80% 0.00%
1980 1.80% 13.00%
1981 9.00% 3.60%
1982 18.60% 0.00%
1983 8.80% 5.50%
1984 31.10% 0.00%
1985 28.20% 5.80%
1986 1.90% 5.90%
1987 0.00% 7.30%
1988 0.00% 35.60%
1989 3.70% 9.00%
1990 1.90% 5.50%
1991 1.80% 8.90%
1992 20.50% 5.80%
1993 48.40% 1.90%
1994 0.00% 17.10%
1995 0.00% 21.60%
1996 19.60% 4.00%
1997 9.90% 1.90%
1998 22.00% 7.10%
1999 0.00% 28.60%
2000 5.50% 3.60%
2001 3.60% 1.80%
2002 6.00% 15.00%
2003 26.50% 3.70%
2004 25.10% 0.00%
2005 1.90% 5.80%
2006 7.30% 1.80%
2007 5.60% 5.60%
2008 30.60% 0.00%
2009 35.10% 6.00%
2010 2.00% 16.00%
2011 41.50% 4.60%
2012 2.30% 14.10%

*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.