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 1.30% 7.00%
1911 0.40% 26.80%
1912 12.50% 0.60%
1913 6.80% 1.00%
1914 8.40% 7.30%
1915 13.40% 5.40%
1916 35.90% 1.20%
1917 14.50% 6.50%
1918 0.00% 20.20%
1919 8.20% 2.60%
1920 23.50% 1.10%
1921 5.20% 2.00%
1922 3.90% 0.70%
1923 1.30% 3.80%
1924 10.80% 6.60%
1925 0.10% 15.90%
1926 2.50% 8.40%
1927 16.10% 2.70%
1928 17.00% 0.40%
1929 18.70% 8.40%
1930 1.80% 7.40%
1931 3.80% 34.90%
1932 3.00% 8.40%
1933 0.90% 3.30%
1934 0.00% 38.30%
1935 0.60% 28.70%
1936 2.30% 12.50%
1937 2.80% 18.80%
1938 3.30% 5.60%
1939 1.70% 9.70%
1940 0.70% 21.50%
1941 21.90% 13.40%
1942 30.20% 8.30%
1943 12.90% 1.70%
1944 2.70% 5.30%
1945 8.50% 1.10%
1946 11.20% 0.30%
1947 10.40% 1.70%
1948 12.20% 3.20%
1949 6.90% 2.40%
1950 11.20% 4.10%
1951 11.50% 9.40%
1952 11.50% 8.90%
1953 2.50% 12.70%
1954 2.10% 30.20%
1955 0.70% 34.50%
1956 4.50% 32.80%
1957 0.20% 9.80%
1958 23.20% 1.10%
1959 3.00% 5.20%
1960 9.10% 6.70%
1961 5.90% 12.40%
1962 2.70% 3.20%
1963 0.00% 12.60%
1964 2.90% 18.40%
1965 9.60% 9.00%
1966 6.20% 9.40%
1967 1.90% 3.80%
1968 5.20% 2.60%
1969 10.00% 1.50%
1970 2.50% 0.20%
1971 6.00% 3.80%
1972 9.80% 2.40%
1973 42.50% 1.00%
1974 24.20% 1.40%
1975 24.30% 0.30%
1976 13.60% 3.20%
1977 3.00% 27.20%
1978 12.60% 0.30%
1979 26.30% 0.70%
1980 13.10% 3.00%
1981 1.80% 16.80%
1982 11.70% 0.70%
1983 43.50% 0.00%
1984 31.60% 0.70%
1985 16.70% 7.20%
1986 7.10% 5.60%
1987 15.00% 1.30%
1988 2.20% 17.60%
1989 2.80% 14.10%
1990 8.90% 20.20%
1991 5.20% 7.80%
1992 15.70% 12.20%
1993 29.60% 0.00%
1994 15.30% 2.90%
1995 16.00% 0.80%
1996 27.90% 7.70%
1997 31.00% 3.40%
1998 19.00% 0.20%
1999 14.00% 8.30%
2000 1.40% 21.10%
2001 5.50% 17.40%
2002 2.10% 31.50%
2003 6.10% 16.40%
2004 9.60% 14.90%
2005 19.70% 4.60%
2006 6.00% 18.10%
2007 4.70% 22.90%
2008 10.70% 12.40%
2009 15.90% 5.40%
2010 16.50% 0.00%
2011 33.90% 17.10%
2012 0.50% 19.10%
2013 2.40% 28.40%
2014 10.70% 16.70%

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.