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% 47.20%
1911 3.60% 9.70%
1912 3.50% 16.10%
1913 8.10% 2.40%
1914 3.50% 12.10%
1915 14.90% 16.20%
1916 0.00% 40.40%
1917 0.00% 50.60%
1918 0.00% 15.90%
1919 14.00% 1.10%
1920 0.00% 6.70%
1921 0.00% 32.10%
1922 3.70% 7.00%
1923 25.20% 1.20%
1924 0.00% 43.70%
1925 0.00% 27.20%
1926 3.40% 6.70%
1927 5.40% 12.50%
1928 2.10% 6.80%
1929 11.30% 4.60%
1930 4.60% 9.90%
1931 5.60% 5.60%
1932 8.70% 2.20%
1933 0.00% 20.80%
1934 1.10% 29.90%
1935 15.60% 11.00%
1936 3.40% 27.10%
1937 7.60% 2.10%
1938 0.00% 11.70%
1939 0.00% 12.70%
1940 6.40% 0.00%
1941 48.60% 1.10%
1942 9.40% 1.10%
1943 0.00% 28.00%
1944 14.20% 2.20%
1945 18.70% 6.70%
1946 6.00% 2.30%
1947 0.00% 3.00%
1948 5.60% 1.20%
1949 36.40% 0.00%
1950 10.10% 2.30%
1951 18.90% 4.60%
1952 0.00% 19.50%
1953 0.00% 9.70%
1954 0.00% 42.40%
1955 1.20% 12.80%
1956 0.00% 30.40%
1957 56.70% 0.00%
1958 26.20% 0.00%
1959 11.20% 2.20%
1960 15.60% 1.10%
1961 19.60% 0.00%
1962 4.30% 3.20%
1963 0.00% 22.90%
1964 0.00% 5.50%
1965 3.10% 2.20%
1966 3.40% 15.30%
1967 3.20% 2.20%
1968 31.00% 4.10%
1969 11.50% 3.20%
1970 2.20% 12.60%
1971 5.50% 1.10%
1972 6.60% 2.20%
1973 44.50% 0.00%
1974 13.10% 5.30%
1975 15.60% 1.00%
1976 7.80% 12.30%
1977 5.20% 4.40%
1978 2.20% 3.20%
1979 11.40% 1.10%
1980 0.00% 16.40%
1981 6.80% 3.40%
1982 15.50% 0.00%
1983 16.20% 1.10%
1984 13.00% 1.10%
1985 9.80% 1.10%
1986 17.90% 0.00%
1987 12.20% 0.00%
1988 0.00% 15.50%
1989 6.60% 2.20%
1990 12.00% 1.10%
1991 41.00% 0.00%
1992 43.10% 1.10%
1993 26.10% 0.00%
1994 11.50% 4.40%
1995 9.10% 3.40%
1996 3.20% 8.00%
1997 23.50% 0.00%
1998 3.20% 5.40%
1999 1.10% 23.50%
2000 1.10% 12.50%
2001 3.40% 5.40%
2002 3.40% 3.20%
2003 3.40% 12.00%
2004 34.10% 2.20%
2005 2.30% 16.40%
2006 0.00% 18.50%
2007 32.40% 9.50%
2008 5.90% 11.10%
2009 23.30% 2.50%
2010 1.10% 15.20%
2011 0.00% 32.00%
2012 1.30% 31.60%

*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.