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% 33.30%
1911 0.00% 24.40%
1912 8.00% 0.00%
1913 0.90% 0.00%
1914 27.70% 1.90%
1915 40.90% 0.00%
1916 0.00% 0.00%
1917 0.00% 50.40%
1918 0.00% 38.90%
1919 48.00% 0.00%
1920 34.80% 0.00%
1921 1.10% 1.60%
1922 0.00% 0.00%
1923 8.70% 0.00%
1924 8.30% 0.90%
1925 0.00% 41.00%
1926 1.70% 1.50%
1927 12.50% 0.00%
1928 9.30% 0.00%
1929 7.30% 0.00%
1930 0.00% 1.20%
1931 17.00% 0.00%
1932 17.10% 0.00%
1933 0.00% 3.40%
1934 0.00% 35.80%
1935 0.00% 18.50%
1936 3.80% 31.70%
1937 0.00% 19.40%
1938 0.00% 8.80%
1939 0.00% 17.00%
1940 0.00% 9.10%
1941 60.70% 1.90%
1942 44.40% 2.40%
1943 0.00% 13.90%
1944 6.30% 1.30%
1945 28.50% 0.00%
1946 19.10% 0.00%
1947 6.90% 1.00%
1948 4.10% 1.30%
1949 8.40% 0.00%
1950 5.30% 0.00%
1951 11.60% 26.70%
1952 0.00% 49.50%
1953 0.00% 48.00%
1954 0.00% 72.60%
1955 0.00% 53.70%
1956 0.00% 79.60%
1957 12.00% 0.00%
1958 39.30% 0.00%
1959 3.90% 0.00%
1960 11.60% 0.00%
1961 33.80% 0.00%
1962 2.70% 1.10%
1963 0.00% 41.10%
1964 0.00% 19.30%
1965 0.00% 1.10%
1966 2.20% 2.00%
1967 0.00% 3.20%
1968 24.50% 0.00%
1969 3.80% 0.00%
1970 0.00% 0.00%
1971 0.00% 2.30%
1972 4.40% 0.00%
1973 58.80% 0.00%
1974 46.80% 0.00%
1975 32.80% 0.00%
1976 2.00% 0.00%
1977 0.50% 0.00%
1978 1.70% 0.70%
1979 27.80% 0.00%
1980 0.00% 3.00%
1981 6.40% 12.00%
1982 1.10% 0.00%
1983 13.80% 0.00%
1984 3.50% 0.00%
1985 18.40% 0.00%
1986 6.00% 1.20%
1987 43.10% 0.00%
1988 0.00% 0.00%
1989 10.70% 7.60%
1990 6.40% 0.50%
1991 25.50% 3.30%
1992 59.40% 0.00%
1993 35.50% 0.00%
1994 5.50% 0.00%
1995 2.80% 0.00%
1996 0.00% 0.00%
1997 23.80% 0.00%
1998 3.40% 1.20%
1999 8.20% 7.30%
2000 1.40% 26.30%
2001 6.50% 0.00%
2002 3.10% 0.00%
2003 9.00% 1.40%
2004 10.60% 0.00%
2005 0.00% 0.00%
2006 0.00% 32.40%
2007 4.30% 6.20%
2008 16.70% 0.00%
2009 19.00% 0.00%
2010 3.50% 4.00%
2011 0.00% 70.50%
2012 0.00% 38.40%
2013 1.90% 23.10%

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.