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% 50.10%
1911 0.00% 0.00%
1912 0.00% 0.00%
1913 9.90% 0.00%
1914 0.00% 0.00%
1915 14.50% 0.00%
1916 13.20% 0.00%
1917 0.00% 28.80%
1918 0.00% 11.10%
1919 0.00% 0.00%
1920 0.00% 0.00%
1921 0.00% 0.00%
1922 33.10% 0.00%
1923 0.00% 55.20%
1924 0.00% 55.60%
1925 10.90% 0.00%
1926 0.00% 11.00%
1927 10.00% 9.40%
1928 0.00% 20.80%
1929 0.00% 67.00%
1930 0.00% 29.30%
1931 0.00% 9.40%
1932 0.00% 30.30%
1933 0.00% 33.50%
1934 0.00% 0.00%
1935 0.00% 0.00%
1936 0.00% 19.30%
1937 20.00% 0.00%
1938 19.70% 0.00%
1939 9.90% 40.30%
1940 29.90% 0.00%
1941 89.90% 0.00%
1942 0.00% 0.00%
1943 0.00% 9.40%
1944 0.00% 0.00%
1945 9.90% 0.00%
1946 0.00% 9.90%
1947 0.00% 39.50%
1948 20.00% 0.00%
1949 0.00% 0.00%
1950 10.10% 0.00%
1951 0.00% 0.00%
1952 30.30% 0.00%
1953 0.00% 20.40%
1954 0.00% 19.70%
1955 0.00% 9.90%
1956 0.00% 11.70%
1957 66.50% 0.00%
1958 9.40% 0.00%
1959 0.00% 90.60%
1960 0.00% 0.00%
1961 0.00% 10.50%
1962 0.00% 30.00%
1963 0.00% 0.00%
1964 0.00% 0.00%
1965 9.90% 0.00%
1966 0.00% 10.50%
1967 0.00% 0.00%
1968 0.00% 0.00%
1969 0.00% 0.00%
1970 9.90% 0.00%
1971 0.00% 0.00%
1972 0.00% 11.70%
1973 44.40% 0.00%
1974 0.00% 0.00%
1975 9.90% 0.00%
1976 0.00% 40.20%
1977 0.00% 0.00%
1978 10.50% 0.00%
1979 0.00% 0.00%
1980 0.00% 0.00%
1981 0.00% 0.00%
1982 20.80% 0.00%
1983 100.00% 0.00%
1984 0.00% 0.00%
1985 0.00% 12.60%
1986 0.00% 0.00%
1987 0.00% 0.00%
1988 0.00% 0.00%
1989 0.00% 23.10%
1990 0.00% 40.20%
1991 0.00% 11.00%
1992 0.00% 0.00%
1993 0.00% 0.00%
1994 0.00% 0.00%
1995 49.70% 0.00%
1996 39.90% 0.00%
1997 0.00% 10.30%
1998 90.10% 0.00%
1999 0.00% 0.00%
2000 0.00% 0.00%
2001 0.00% 0.00%
2002 0.00% 33.00%
2003 0.00% 0.00%
2004 0.00% 10.90%
2005 40.30% 0.00%
2006 72.20% 0.00%
2007 0.00% 39.70%
2008 0.00% 11.00%
2009 0.00% 0.00%
2010 87.70% 0.00%
2011 26.30% 0.00%
2012 13.50% 0.00%

*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.