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 13.10%
1911 36.70%
1912 71.30%
1913 22.90%
1914 5.60%
1915 37.50%
1916 18.80%
1917 46.40%
1918 4.00%
1919 21.70%
1920 26.20%
1921 42.40%
1922 10.60%
1923 11.20%
1924 38.70%
1925 31.80%
1926 22.20%
1927 13.20%
1928 7.20%
1929 24.70%
1930 14.50%
1931 31.50%
1932 13.80%
1933 33.70%
1934 61.70%
1935 1.60%
1936 9.20%
1937 9.40%
1938 12.40%
1939 19.10%
1940 42.40%
1941 15.60%
1942 5.00%
1943 10.00%
1944 11.50%
1945 5.20%
1946 10.80%
1947 3.20%
1948 8.50%
1949 21.30%
1950 25.40%
1951 21.60%
1952 16.80%
1953 23.50%
1954 43.70%
1955 23.00%
1956 14.60%
1957 4.40%
1958 40.40%
1959 3.00%
1960 21.70%
1961 7.70%
1962 4.00%
1963 4.40%
1964 13.60%
1965 33.70%
1966 13.20%
1967 4.00%
1968 12.20%
1969 7.80%
1970 3.30%
1971 3.10%
1972 7.20%
1973 21.30%
1974 1.70%
1975 25.30%
1976 9.00%
1977 1.10%
1978 33.50%
1979 52.70%
1980 3.40%
1981 20.20%
1982 24.80%
1983 15.20%
1984 12.50%
1985 3.10%
1986 9.30%
1987 29.20%
1988 20.40%
1989 11.70%
1990 20.30%
1991 13.60%
1992 23.30%
1993 32.00%
1994 26.60%
1995 1.20%
1996 20.50%
1997 5.60%
1998 30.10%
1999 15.30%
2000 49.70%
2001 11.00%
2002 30.20%
2003 32.30%
2004 7.00%
2005 9.40%
2006 50.90%
2007 33.20%
2008 5.20%
2009 14.10%
2010 11.70%
2011 23.60%
2012 84.90%
2013 11.40%
2014 36.70%

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.