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 59.50%
1911 14.40%
1912 34.80%
1913 3.90%
1914 6.50%
1915 30.60%
1916 9.70%
1917 53.90%
1918 17.80%
1919 5.70%
1920 31.60%
1921 30.10%
1922 19.10%
1923 10.90%
1924 55.10%
1925 32.80%
1926 47.00%
1927 9.90%
1928 6.40%
1929 5.60%
1930 2.10%
1931 40.70%
1932 5.60%
1933 11.40%
1934 53.20%
1935 14.80%
1936 16.80%
1937 2.60%
1938 13.20%
1939 15.20%
1940 29.30%
1941 19.00%
1942 8.40%
1943 7.40%
1944 12.30%
1945 20.50%
1946 27.20%
1947 41.10%
1948 17.00%
1949 3.30%
1950 26.10%
1951 8.90%
1952 3.20%
1953 3.90%
1954 3.70%
1955 37.40%
1956 10.10%
1957 16.70%
1958 32.10%
1959 1.70%
1960 34.20%
1961 11.60%
1962 1.20%
1963 22.60%
1964 10.50%
1965 19.30%
1966 8.30%
1967 35.70%
1968 3.10%
1969 9.00%
1970 9.80%
1971 9.90%
1972 19.40%
1973 12.90%
1974 18.00%
1975 39.90%
1976 2.50%
1977 43.60%
1978 6.50%
1979 6.90%
1980 13.70%
1981 9.70%
1982 1.60%
1983 50.90%
1984 31.40%
1985 29.90%
1986 19.50%
1987 44.20%
1988 13.30%
1989 18.50%
1990 0.50%
1991 27.70%
1992 31.10%
1993 22.00%
1994 18.30%
1995 15.80%
1996 24.00%
1997 12.90%
1998 17.10%
1999 4.30%
2000 41.10%
2001 7.10%
2002 18.10%
2003 1.60%
2004 40.90%
2005 2.00%
2006 32.60%
2007 36.80%
2008 3.20%
2009 2.30%
2010 24.80%
2011 30.20%
2012 79.30%
2013 33.10%
2014 13.50%

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.