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% 10.20%
1911 0.00% 20.90%
1912 18.30% 0.00%
1913 6.60% 0.50%
1914 11.50% 9.60%
1915 23.90% 1.40%
1916 25.40% 0.00%
1917 7.30% 8.60%
1918 0.10% 19.00%
1919 15.00% 3.90%
1920 20.60% 0.50%
1921 4.00% 1.40%
1922 4.10% 1.50%
1923 4.40% 4.10%
1924 7.60% 7.70%
1925 0.30% 16.20%
1926 2.40% 6.30%
1927 19.00% 3.30%
1928 20.60% 0.00%
1929 14.30% 6.70%
1930 2.40% 10.30%
1931 5.00% 34.70%
1932 6.80% 7.10%
1933 0.70% 4.10%
1934 0.00% 55.60%
1935 1.50% 24.70%
1936 2.80% 23.00%
1937 3.80% 20.60%
1938 4.50% 3.60%
1939 0.30% 13.90%
1940 0.70% 21.10%
1941 28.20% 12.20%
1942 25.40% 3.00%
1943 8.00% 3.60%
1944 4.80% 6.50%
1945 11.00% 0.10%
1946 10.40% 0.50%
1947 8.30% 1.50%
1948 14.10% 4.60%
1949 6.50% 2.50%
1950 12.00% 4.30%
1951 15.50% 7.20%
1952 6.90% 10.80%
1953 2.70% 15.50%
1954 4.50% 38.50%
1955 0.10% 28.30%
1956 6.20% 36.10%
1957 3.10% 6.10%
1958 20.70% 1.50%
1959 4.10% 5.20%
1960 7.80% 7.70%
1961 6.40% 8.10%
1962 2.00% 2.10%
1963 0.20% 18.20%
1964 4.60% 19.80%
1965 12.80% 7.90%
1966 5.60% 9.10%
1967 1.80% 1.20%
1968 5.70% 0.70%
1969 5.70% 0.80%
1970 2.40% 0.10%
1971 9.50% 2.20%
1972 9.90% 1.50%
1973 35.70% 1.10%
1974 21.70% 0.30%
1975 27.20% 0.40%
1976 9.40% 5.50%
1977 0.70% 17.70%
1978 14.00% 2.60%
1979 27.00% 0.50%
1980 8.30% 4.80%
1981 3.00% 12.90%
1982 14.20% 0.00%
1983 40.40% 0.00%
1984 26.20% 1.20%
1985 17.80% 2.10%
1986 10.60% 6.90%
1987 13.30% 3.40%
1988 2.50% 23.30%
1989 7.50% 17.40%
1990 5.90% 14.60%
1991 4.20% 4.40%
1992 17.50% 10.30%
1993 29.60% 0.00%
1994 14.80% 2.40%
1995 19.90% 0.80%
1996 25.10% 5.60%
1997 28.30% 1.00%
1998 20.80% 0.70%
1999 10.90% 9.50%
2000 1.60% 23.00%
2001 2.60% 19.50%
2002 1.70% 31.20%
2003 12.70% 17.50%
2004 10.50% 4.70%
2005 14.00% 1.50%
2006 3.80% 16.00%
2007 3.80% 25.50%
2008 13.70% 10.10%
2009 19.00% 3.20%
2010 14.90% 0.10%
2011 24.90% 24.90%
2012 1.00% 27.40%
2013 5.60% 24.00%
2014 13.40% 14.20%

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.