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 0.50% 15.80%
1911 0.60% 20.90%
1912 16.40% 0.00%
1913 3.60% 1.20%
1914 10.00% 10.80%
1915 32.70% 0.80%
1916 19.20% 0.00%
1917 7.00% 8.80%
1918 0.10% 21.70%
1919 16.00% 9.70%
1920 21.30% 0.00%
1921 5.90% 2.90%
1922 6.40% 1.10%
1923 6.10% 3.50%
1924 6.00% 12.90%
1925 0.50% 23.30%
1926 2.10% 7.20%
1927 19.20% 2.20%
1928 24.80% 0.00%
1929 10.30% 3.80%
1930 1.60% 16.10%
1931 5.40% 32.50%
1932 3.40% 5.20%
1933 0.90% 4.70%
1934 0.00% 61.20%
1935 3.90% 8.40%
1936 2.00% 32.00%
1937 5.20% 14.90%
1938 6.10% 1.80%
1939 0.50% 11.00%
1940 0.60% 14.80%
1941 30.40% 11.70%
1942 22.80% 2.40%
1943 5.30% 3.60%
1944 7.80% 4.80%
1945 17.10% 0.30%
1946 7.30% 1.30%
1947 11.10% 1.90%
1948 13.50% 3.60%
1949 6.70% 3.20%
1950 11.70% 3.40%
1951 13.50% 5.80%
1952 7.90% 6.30%
1953 6.10% 13.10%
1954 3.60% 32.10%
1955 0.10% 14.60%
1956 3.30% 29.90%
1957 10.40% 6.00%
1958 18.10% 1.80%
1959 1.70% 8.50%
1960 5.70% 5.00%
1961 7.60% 10.90%
1962 4.30% 2.50%
1963 0.60% 13.10%
1964 3.60% 16.70%
1965 16.80% 8.10%
1966 4.50% 10.30%
1967 4.40% 2.10%
1968 8.80% 0.70%
1969 3.90% 0.40%
1970 1.20% 0.70%
1971 6.50% 3.50%
1972 11.70% 5.20%
1973 32.00% 6.70%
1974 10.10% 0.30%
1975 23.40% 0.40%
1976 6.90% 5.20%
1977 0.00% 14.40%
1978 13.20% 1.40%
1979 25.10% 0.50%
1980 7.80% 8.00%
1981 6.80% 7.60%
1982 12.30% 0.00%
1983 37.00% 0.00%
1984 23.70% 2.10%
1985 12.50% 3.60%
1986 6.70% 6.90%
1987 13.10% 5.00%
1988 0.50% 28.30%
1989 14.00% 16.40%
1990 6.30% 9.70%
1991 5.40% 5.70%
1992 20.30% 7.40%
1993 29.40% 0.30%
1994 7.50% 2.10%
1995 32.00% 3.10%
1996 17.20% 6.80%
1997 19.70% 4.40%
1998 21.60% 2.60%
1999 13.30% 10.60%
2000 3.20% 20.40%
2001 2.50% 18.20%
2002 1.10% 31.60%
2003 14.90% 10.80%
2004 12.20% 10.20%
2005 18.50% 2.90%
2006 4.20% 20.30%
2007 13.00% 30.90%
2008 11.10% 7.20%
2009 13.80% 3.50%
2010 17.30% 1.80%
2011 28.50% 26.20%
2012 2.20% 38.70%
2013 11.80% 21.80%
2014 12.00% 13.70%

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.