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 16.70%
1911 32.60%
1912 73.60%
1913 26.30%
1914 3.50%
1915 32.80%
1916 22.70%
1917 48.60%
1918 3.60%
1919 19.70%
1920 24.20%
1921 44.10%
1922 11.30%
1923 19.60%
1924 29.20%
1925 20.00%
1926 24.70%
1927 13.70%
1928 5.20%
1929 22.20%
1930 9.20%
1931 31.40%
1932 12.40%
1933 28.60%
1934 64.20%
1935 3.00%
1936 7.10%
1937 5.90%
1938 27.20%
1939 26.90%
1940 38.90%
1941 20.00%
1942 3.90%
1943 8.20%
1944 9.70%
1945 3.40%
1946 14.10%
1947 0.90%
1948 8.00%
1949 27.20%
1950 23.50%
1951 24.90%
1952 8.90%
1953 33.20%
1954 43.70%
1955 20.00%
1956 19.90%
1957 13.40%
1958 40.70%
1959 5.50%
1960 17.50%
1961 6.30%
1962 2.90%
1963 11.40%
1964 9.90%
1965 20.10%
1966 18.30%
1967 3.10%
1968 9.80%
1969 16.40%
1970 4.20%
1971 3.40%
1972 13.50%
1973 17.40%
1974 2.10%
1975 25.70%
1976 8.10%
1977 1.20%
1978 29.30%
1979 48.40%
1980 2.10%
1981 12.80%
1982 28.90%
1983 12.40%
1984 14.50%
1985 4.00%
1986 6.20%
1987 29.50%
1988 22.10%
1989 10.90%
1990 18.50%
1991 13.20%
1992 28.90%
1993 35.40%
1994 22.10%
1995 1.30%
1996 20.00%
1997 5.80%
1998 31.50%
1999 13.60%
2000 51.50%
2001 16.70%
2002 21.20%
2003 43.60%
2004 4.70%
2005 11.30%
2006 38.10%
2007 36.50%
2008 6.70%
2009 14.20%
2010 12.30%
2011 21.90%
2012 83.70%
2013 11.30%
2014 40.20%

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.