U.S. Climate Extremes Index (CEI)

NCDC transitioned to the nClimDiv dataset on Thursday, March 13, 2014. This was coincident with the release of the February 2014 monthly monitoring report. For details on this transition, please visit our public FTP site and our U.S. Climate Divisional Database site.

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 0.20% 8.90%
1911 0.00% 24.10%
1912 17.90% 0.30%
1913 6.30% 0.50%
1914 10.50% 9.00%
1915 22.80% 0.90%
1916 24.90% 0.00%
1917 8.80% 7.40%
1918 0.00% 21.70%
1919 14.00% 4.30%
1920 23.60% 0.30%
1921 4.10% 1.70%
1922 4.60% 1.00%
1923 1.90% 4.30%
1924 8.30% 9.20%
1925 0.10% 16.70%
1926 2.40% 6.90%
1927 17.30% 2.50%
1928 21.30% 0.00%
1929 15.30% 6.60%
1930 1.80% 9.70%
1931 4.10% 33.90%
1932 5.40% 9.00%
1933 0.40% 4.10%
1934 0.00% 52.00%
1935 1.70% 24.40%
1936 3.00% 21.40%
1937 3.30% 20.40%
1938 4.20% 3.90%
1939 0.20% 12.20%
1940 0.70% 21.10%
1941 27.50% 11.90%
1942 26.30% 4.00%
1943 8.50% 3.40%
1944 4.80% 6.30%
1945 12.00% 0.10%
1946 10.20% 0.40%
1947 7.40% 1.10%
1948 14.30% 3.50%
1949 6.50% 2.20%
1950 11.80% 4.30%
1951 15.20% 6.50%
1952 8.80% 10.20%
1953 2.70% 14.40%
1954 3.70% 35.40%
1955 0.00% 27.70%
1956 4.80% 33.70%
1957 2.20% 7.50%
1958 20.20% 1.50%
1959 3.00% 5.10%
1960 7.40% 7.50%
1961 6.40% 9.80%
1962 2.40% 1.90%
1963 0.20% 15.90%
1964 4.10% 19.60%
1965 12.80% 7.40%
1966 5.60% 8.50%
1967 2.10% 1.20%
1968 4.60% 1.60%
1969 6.90% 1.00%
1970 2.60% 0.40%
1971 9.00% 2.20%
1972 9.20% 2.40%
1973 36.60% 1.70%
1974 21.40% 0.30%
1975 25.50% 0.40%
1976 10.60% 4.80%
1977 1.00% 20.50%
1978 15.90% 2.40%
1979 27.70% 0.50%
1980 9.00% 5.00%
1981 3.70% 13.00%
1982 14.70% 0.10%
1983 39.30% 0.00%
1984 26.90% 1.20%
1985 17.30% 4.10%
1986 9.10% 7.40%
1987 13.20% 2.20%
1988 3.70% 23.20%
1989 6.30% 15.00%
1990 4.80% 15.10%
1991 4.70% 4.50%
1992 17.80% 10.40%
1993 29.00% 0.00%
1994 15.00% 3.70%
1995 21.50% 2.20%
1996 25.10% 6.80%
1997 28.70% 1.70%
1998 19.80% 0.90%
1999 12.40% 10.10%
2000 2.50% 24.40%
2001 3.20% 18.10%
2002 1.40% 30.10%
2003 11.40% 16.10%
2004 10.30% 10.90%
2005 15.90% 1.30%
2006 3.40% 16.70%
2007 6.90% 25.30%
2008 11.70% 9.70%
2009 17.20% 4.80%
2010 16.50% 0.10%
2011 28.50% 24.40%
2012 1.00% 23.00%
2013 5.30% 25.30%
2014 12.30% 15.00%

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.