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% 61.10%
1911 0.00% 52.10%
1912 14.50% 4.00%
1913 6.90% 0.00%
1914 2.10% 10.10%
1915 10.10% 0.00%
1916 18.10% 0.00%
1917 4.00% 0.00%
1918 0.00% 17.10%
1919 4.90% 0.00%
1920 2.40% 4.40%
1921 0.00% 3.10%
1922 0.00% 18.20%
1923 0.00% 21.30%
1924 1.80% 12.80%
1925 0.00% 10.40%
1926 0.00% 0.00%
1927 7.90% 0.00%
1928 11.80% 0.00%
1929 0.00% 0.00%
1930 0.00% 27.30%
1931 0.00% 55.40%
1932 8.80% 11.90%
1933 0.00% 29.50%
1934 0.00% 79.20%
1935 6.70% 17.90%
1936 0.00% 13.90%
1937 0.00% 19.90%
1938 12.40% 4.10%
1939 0.00% 14.00%
1940 0.00% 25.60%
1941 0.00% 0.00%
1942 14.90% 0.00%
1943 3.80% 0.00%
1944 4.90% 0.00%
1945 17.30% 0.00%
1946 0.00% 4.40%
1947 0.00% 0.00%
1948 0.00% 24.10%
1949 0.00% 12.80%
1950 25.30% 5.10%
1951 55.20% 0.00%
1952 11.00% 0.00%
1953 3.90% 7.00%
1954 0.00% 6.30%
1955 0.00% 13.80%
1956 0.00% 37.10%
1957 0.00% 13.90%
1958 0.00% 9.30%
1959 0.00% 4.00%
1960 31.20% 0.00%
1961 7.00% 3.50%
1962 0.00% 2.60%
1963 0.00% 27.20%
1964 0.00% 37.00%
1965 15.30% 2.60%
1966 14.10% 0.00%
1967 5.70% 2.90%
1968 10.50% 0.00%
1969 14.30% 0.00%
1970 0.00% 0.00%
1971 14.10% 2.60%
1972 15.40% 0.00%
1973 35.60% 0.00%
1974 14.40% 0.00%
1975 17.20% 0.00%
1976 0.00% 19.00%
1977 0.00% 19.20%
1978 25.60% 0.00%
1979 32.10% 0.00%
1980 2.80% 0.00%
1981 9.80% 12.20%
1982 13.90% 0.00%
1983 48.70% 0.00%
1984 31.30% 0.00%
1985 41.10% 0.00%
1986 41.40% 0.00%
1987 2.00% 14.10%
1988 0.00% 50.20%
1989 0.00% 50.00%
1990 7.10% 13.10%
1991 25.10% 0.00%
1992 10.80% 0.00%
1993 62.70% 0.00%
1994 44.30% 0.00%
1995 12.80% 0.00%
1996 31.50% 0.00%
1997 10.60% 0.00%
1998 14.40% 8.50%
1999 10.40% 8.70%
2000 0.00% 8.00%
2001 8.10% 0.00%
2002 5.50% 0.00%
2003 0.00% 6.50%
2004 1.20% 0.00%
2005 15.50% 2.70%
2006 1.80% 10.90%
2007 5.80% 7.70%
2008 28.90% 0.00%
2009 41.40% 10.20%
2010 40.00% 0.00%
2011 10.80% 0.00%
2012 0.00% 26.20%
2013 18.90% 5.60%

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.