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 41.00%
1911 16.98%
1912 32.54%
1913 20.72%
1914 9.70%
1915 11.48%
1916 39.44%
1917 19.00%
1918 8.28%
1919 38.50%
1920 4.36%
1921 10.56%
1922 26.98%
1923 12.36%
1924 29.62%
1925 10.64%
1926 29.92%
1927 11.28%
1928 4.20%
1929 11.38%
1930 20.86%
1931 28.50%
1932 9.40%
1933 14.08%
1934 27.98%
1935 15.70%
1936 15.14%
1937 15.84%
1938 13.90%
1939 13.60%
1940 25.24%
1941 25.12%
1942 8.94%
1943 17.96%
1944 18.08%
1945 13.90%
1946 6.26%
1947 19.80%
1948 24.82%
1949 14.36%
1950 6.36%
1951 23.78%
1952 3.18%
1953 21.16%
1954 40.06%
1955 11.30%
1956 8.10%
1957 14.14%
1958 37.34%
1959 3.90%
1960 8.76%
1961 33.04%
1962 10.34%
1963 18.20%
1964 24.86%
1965 14.50%
1966 13.36%
1967 43.14%
1968 10.18%
1969 7.08%
1970 16.58%
1971 9.30%
1972 11.06%
1973 15.42%
1974 7.38%
1975 11.06%
1976 31.30%
1977 27.98%
1978 12.78%
1979 3.52%
1980 26.38%
1981 3.98%
1982 16.90%
1983 44.66%
1984 28.98%
1985 15.76%
1986 6.36%
1987 8.26%
1988 13.48%
1989 2.50%
1990 21.56%
1991 9.70%
1992 39.48%
1993 53.78%
1994 13.46%
1995 28.00%
1996 19.86%
1997 20.04%
1998 31.90%
1999 7.80%
2000 10.26%
2001 15.16%
2002 12.40%
2003 41.00%
2004 28.20%
2005 7.60%
2006 21.06%
2007 23.82%
2008 6.38%
2009 23.68%
2010 14.70%
2011 13.24%
2012 12.94%
2013 39.70%

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.