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.

Year Percent
1910 15.80%
1911 25.60%
1912 63.80%
1913 24.30%
1914 6.70%
1915 25.70%
1916 24.60%
1917 36.30%
1918 3.60%
1919 19.90%
1920 32.50%
1921 44.00%
1922 14.10%
1923 18.20%
1924 23.40%
1925 16.80%
1926 27.20%
1927 19.60%
1928 5.30%
1929 32.50%
1930 9.90%
1931 35.20%
1932 6.60%
1933 26.00%
1934 66.50%
1935 3.50%
1936 8.10%
1937 3.30%
1938 28.50%
1939 29.20%
1940 35.40%
1941 18.10%
1942 2.90%
1943 7.80%
1944 11.00%
1945 4.50%
1946 15.90%
1947 2.30%
1948 8.70%
1949 10.00%
1950 24.50%
1951 26.70%
1952 8.30%
1953 35.30%
1954 44.80%
1955 17.70%
1956 12.30%
1957 20.80%
1958 31.80%
1959 8.50%
1960 8.40%
1961 6.90%
1962 1.90%
1963 17.00%
1964 11.70%
1965 14.90%
1966 13.50%
1967 7.90%
1968 13.30%
1969 13.00%
1970 7.20%
1971 4.30%
1972 18.80%
1973 13.70%
1974 1.70%
1975 25.10%
1976 12.10%
1977 2.00%
1978 24.60%
1979 50.00%
1980 2.20%
1981 18.10%
1982 31.70%
1983 12.90%
1984 13.30%
1985 10.90%
1986 5.50%
1987 31.70%
1988 18.80%
1989 8.00%
1990 27.30%
1991 8.70%
1992 28.40%
1993 41.80%
1994 10.40%
1995 2.50%
1996 36.10%
1997 11.30%
1998 33.70%
1999 38.00%
2000 26.40%
2001 22.30%
2002 17.70%
2003 27.00%
2004 3.80%
2005 16.40%
2006 44.20%
2007 40.10%
2008 7.00%
2009 10.40%
2010 12.70%
2011 23.50%
2012 83.40%
2013 12.30%
2014 45.60%

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.