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 0.00% 10.10%
1911 2.70% 26.60%
1912 16.80% 0.30%
1913 7.30% 0.20%
1914 7.20% 7.10%
1915 13.00% 8.60%
1916 28.20% 1.30%
1917 14.10% 6.80%
1918 0.00% 21.50%
1919 10.20% 2.30%
1920 24.30% 0.50%
1921 5.40% 1.70%
1922 4.30% 1.80%
1923 2.00% 3.90%
1924 11.00% 6.90%
1925 0.10% 19.90%
1926 2.90% 7.90%
1927 17.50% 3.20%
1928 13.90% 0.50%
1929 20.00% 7.30%
1930 1.80% 5.90%
1931 5.80% 31.60%
1932 2.20% 7.10%
1933 2.10% 1.90%
1934 0.00% 45.00%
1935 0.50% 26.00%
1936 2.20% 11.30%
1937 2.80% 18.60%
1938 4.10% 4.80%
1939 1.50% 10.10%
1940 0.70% 18.90%
1941 23.60% 17.50%
1942 29.60% 8.30%
1943 11.70% 0.90%
1944 2.90% 4.10%
1945 11.40% 1.70%
1946 9.30% 1.10%
1947 8.50% 3.30%
1948 11.70% 2.10%
1949 4.80% 3.00%
1950 11.70% 5.10%
1951 12.10% 8.20%
1952 16.00% 7.10%
1953 3.40% 10.80%
1954 2.70% 29.90%
1955 0.70% 34.10%
1956 5.50% 30.10%
1957 1.60% 9.90%
1958 23.60% 2.00%
1959 3.30% 8.70%
1960 8.60% 6.80%
1961 6.80% 11.40%
1962 1.80% 2.40%
1963 0.00% 12.60%
1964 3.50% 12.50%
1965 7.10% 9.30%
1966 6.20% 8.00%
1967 1.60% 8.30%
1968 4.60% 2.90%
1969 8.90% 2.40%
1970 3.00% 0.30%
1971 6.80% 4.60%
1972 7.80% 6.00%
1973 47.20% 3.10%
1974 21.30% 1.60%
1975 23.10% 0.10%
1976 11.80% 3.00%
1977 1.70% 29.70%
1978 10.00% 0.40%
1979 27.50% 0.20%
1980 18.20% 2.90%
1981 1.50% 18.30%
1982 11.80% 0.30%
1983 48.80% 0.00%
1984 32.10% 1.20%
1985 14.20% 9.20%
1986 4.90% 6.40%
1987 15.60% 4.10%
1988 0.30% 16.70%
1989 2.80% 12.80%
1990 9.50% 17.50%
1991 8.40% 5.60%
1992 16.60% 15.10%
1993 28.10% 0.00%
1994 14.00% 2.20%
1995 15.70% 0.80%
1996 28.10% 14.50%
1997 27.90% 3.40%
1998 21.70% 0.20%
1999 12.10% 8.50%
2000 3.00% 21.60%
2001 6.00% 17.80%
2002 4.40% 29.30%
2003 4.30% 13.00%
2004 6.70% 14.40%
2005 20.00% 5.00%
2006 6.60% 19.20%
2007 6.50% 23.20%
2008 11.30% 10.30%
2009 15.50% 4.40%
2010 14.40% 2.20%
2011 38.10% 16.60%
2012 1.00% 20.20%
2013 2.90% 30.90%

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.