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% 67.30%
1911 10.70% 25.60%
1912 11.90% 16.80%
1913 8.60% 15.50%
1914 9.30% 13.90%
1915 29.10% 0.00%
1916 2.20% 9.10%
1917 8.60% 17.20%
1918 8.70% 14.20%
1919 2.30% 24.90%
1920 8.40% 10.10%
1921 0.00% 19.70%
1922 7.80% 15.90%
1923 2.20% 9.80%
1924 2.00% 17.30%
1925 1.90% 15.40%
1926 4.20% 11.80%
1927 21.40% 0.00%
1928 0.00% 26.40%
1929 3.90% 9.50%
1930 0.00% 13.90%
1931 0.00% 47.70%
1932 3.90% 5.80%
1933 0.00% 31.40%
1934 0.00% 49.90%
1935 0.00% 3.90%
1936 2.20% 20.40%
1937 5.80% 11.60%
1938 2.00% 2.00%
1939 0.00% 24.20%
1940 3.90% 2.00%
1941 26.60% 0.00%
1942 20.00% 0.00%
1943 0.00% 7.90%
1944 25.70% 1.90%
1945 23.80% 3.80%
1946 1.90% 7.70%
1947 22.30% 2.00%
1948 2.10% 4.00%
1949 4.10% 3.80%
1950 15.10% 6.10%
1951 27.80% 2.00%
1952 0.00% 30.70%
1953 7.30% 5.80%
1954 1.80% 15.90%
1955 5.40% 10.00%
1956 1.90% 14.40%
1957 21.50% 0.00%
1958 6.10% 4.00%
1959 3.90% 2.00%
1960 0.00% 11.60%
1961 3.90% 19.20%
1962 7.90% 0.00%
1963 3.90% 0.00%
1964 3.70% 6.00%
1965 37.30% 0.00%
1966 0.00% 13.50%
1967 9.60% 3.80%
1968 17.10% 0.00%
1969 11.90% 0.00%
1970 9.50% 7.70%
1971 16.10% 0.00%
1972 17.70% 1.90%
1973 8.50% 13.50%
1974 1.90% 10.10%
1975 10.40% 4.30%
1976 0.00% 31.70%
1977 13.50% 0.00%
1978 12.10% 1.90%
1979 4.20% 12.20%
1980 1.90% 8.20%
1981 0.00% 0.00%
1982 31.80% 0.00%
1983 14.30% 3.90%
1984 19.30% 2.00%
1985 14.60% 2.10%
1986 22.40% 0.00%
1987 4.00% 19.20%
1988 0.00% 27.70%
1989 7.60% 8.20%
1990 5.50% 15.10%
1991 4.00% 4.10%
1992 6.20% 7.90%
1993 43.60% 1.90%
1994 5.80% 7.80%
1995 21.20% 1.80%
1996 34.20% 1.80%
1997 8.00% 2.10%
1998 31.10% 0.00%
1999 7.90% 1.90%
2000 8.00% 3.90%
2001 0.00% 12.00%
2002 0.00% 14.10%
2003 4.00% 4.00%
2004 13.00% 2.00%
2005 7.70% 1.80%
2006 2.00% 12.30%
2007 8.10% 6.00%
2008 25.20% 0.00%
2009 36.20% 0.00%
2010 39.10% 4.70%
2011 24.60% 0.00%
2012 7.40% 30.20%

*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.