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% 23.10%
1911 0.00% 38.00%
1912 0.50% 0.00%
1913 0.00% 2.90%
1914 0.00% 22.80%
1915 0.00% 13.70%
1916 0.50% 0.00%
1917 0.00% 0.00%
1918 0.00% 8.70%
1919 0.00% 0.00%
1920 12.20% 0.00%
1921 0.00% 12.20%
1922 0.00% 0.40%
1923 0.00% 4.60%
1924 0.00% 0.00%
1925 0.00% 21.40%
1926 0.00% 0.00%
1927 13.70% 0.00%
1928 26.10% 0.00%
1929 8.20% 0.00%
1930 0.00% 29.30%
1931 0.00% 30.60%
1932 0.00% 0.00%
1933 2.50% 0.00%
1934 0.00% 19.60%
1935 3.50% 3.80%
1936 1.80% 15.10%
1937 10.70% 0.00%
1938 3.50% 0.00%
1939 0.60% 3.70%
1940 0.00% 9.20%
1941 0.00% 53.00%
1942 0.00% 10.90%
1943 0.00% 19.90%
1944 0.00% 7.90%
1945 28.00% 0.00%
1946 0.00% 0.00%
1947 0.00% 2.90%
1948 4.80% 21.60%
1949 0.40% 33.80%
1950 15.80% 12.40%
1951 31.40% 1.30%
1952 10.50% 0.00%
1953 2.60% 2.50%
1954 31.50% 38.30%
1955 0.00% 21.60%
1956 2.60% 15.00%
1957 24.50% 33.50%
1958 32.60% 0.00%
1959 0.00% 0.40%
1960 0.70% 0.00%
1961 0.70% 0.00%
1962 0.00% 15.90%
1963 0.00% 53.80%
1964 0.00% 59.90%
1965 0.00% 70.10%
1966 0.00% 56.70%
1967 0.00% 0.00%
1968 6.30% 0.00%
1969 0.00% 0.50%
1970 0.00% 0.00%
1971 0.50% 0.00%
1972 39.90% 0.00%
1973 72.60% 0.00%
1974 38.60% 0.00%
1975 32.00% 0.00%
1976 44.40% 0.00%
1977 23.50% 0.00%
1978 4.00% 0.00%
1979 28.50% 0.00%
1980 0.00% 16.60%
1981 0.00% 9.80%
1982 0.00% 0.00%
1983 5.70% 0.00%
1984 2.30% 0.00%
1985 2.50% 10.50%
1986 0.00% 10.50%
1987 0.00% 1.90%
1988 0.00% 12.00%
1989 19.70% 0.00%
1990 35.60% 0.00%
1991 12.40% 12.20%
1992 6.50% 0.40%
1993 10.50% 0.00%
1994 6.20% 0.00%
1995 0.00% 1.60%
1996 62.10% 0.00%
1997 26.30% 0.00%
1998 3.20% 3.70%
1999 0.00% 15.20%
2000 0.00% 13.60%
2001 0.00% 21.30%
2002 0.00% 28.80%
2003 25.30% 0.00%
2004 26.90% 0.00%
2005 25.10% 0.00%
2006 53.70% 15.20%
2007 33.90% 0.60%
2008 64.00% 2.10%
2009 54.50% 0.00%
2010 11.50% 0.00%
2011 52.30% 10.20%
2012 0.00% 22.30%
2013 0.00% 0.40%

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.