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% 7.50%
1911 0.40% 24.90%
1912 16.10% 0.30%
1913 5.60% 0.10%
1914 8.50% 8.90%
1915 19.70% 1.70%
1916 27.10% 0.10%
1917 12.00% 7.40%
1918 0.00% 22.40%
1919 14.20% 3.90%
1920 25.60% 0.30%
1921 5.60% 1.90%
1922 4.30% 0.70%
1923 1.60% 3.70%
1924 8.50% 7.50%
1925 0.10% 15.50%
1926 2.20% 7.80%
1927 19.00% 2.50%
1928 19.00% 0.00%
1929 16.80% 6.30%
1930 2.10% 10.80%
1931 4.20% 34.40%
1932 5.00% 8.40%
1933 0.40% 4.30%
1934 0.00% 47.90%
1935 1.50% 24.80%
1936 2.80% 19.80%
1937 3.00% 18.30%
1938 3.70% 4.60%
1939 1.40% 10.10%
1940 0.70% 23.30%
1941 25.80% 12.90%
1942 27.70% 4.50%
1943 12.10% 3.40%
1944 4.40% 5.50%
1945 9.50% 0.80%
1946 10.40% 1.10%
1947 7.40% 1.60%
1948 13.30% 3.80%
1949 7.30% 2.80%
1950 11.90% 4.80%
1951 13.30% 7.50%
1952 10.60% 8.90%
1953 2.90% 14.50%
1954 3.10% 32.80%
1955 0.00% 29.50%
1956 4.80% 32.20%
1957 2.00% 9.30%
1958 19.90% 1.20%
1959 3.40% 9.00%
1960 8.00% 7.70%
1961 6.90% 12.90%
1962 2.40% 1.50%
1963 0.00% 13.90%
1964 4.00% 18.80%
1965 12.30% 8.60%
1966 5.20% 8.70%
1967 1.80% 2.70%
1968 4.40% 1.90%
1969 8.30% 1.00%
1970 2.10% 0.30%
1971 6.40% 2.20%
1972 10.60% 4.10%
1973 40.40% 4.10%
1974 21.00% 0.30%
1975 23.50% 0.40%
1976 11.90% 3.80%
1977 0.40% 23.00%
1978 13.90% 0.40%
1979 26.10% 0.50%
1980 7.10% 4.20%
1981 2.30% 13.00%
1982 14.20% 0.40%
1983 40.00% 0.00%
1984 30.00% 1.20%
1985 15.80% 4.80%
1986 6.40% 6.80%
1987 13.90% 1.10%
1988 2.40% 21.00%
1989 5.30% 13.90%
1990 5.10% 14.60%
1991 5.60% 4.60%
1992 17.30% 11.80%
1993 31.80% 0.00%
1994 14.40% 3.50%
1995 20.20% 1.50%
1996 25.40% 6.80%
1997 28.50% 3.40%
1998 20.00% 0.90%
1999 12.60% 10.40%
2000 2.50% 23.10%
2001 3.20% 18.50%
2002 1.40% 29.80%
2003 10.20% 15.20%
2004 10.00% 11.00%
2005 16.90% 2.40%
2006 4.20% 16.00%
2007 8.70% 24.60%
2008 12.20% 10.50%
2009 16.50% 5.20%
2010 16.00% 0.10%
2011 33.80% 22.90%
2012 0.70% 19.40%
2013 4.80% 27.90%
2014 11.80% 16.40%

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.