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.

Download: Warm Data | Cold Data
Year Warm Cold
1910 0.00% 80.50%
1911 0.00% 26.80%
1912 0.00% 13.70%
1913 0.00% 2.00%
1914 0.00% 15.20%
1915 5.70% 15.80%
1916 0.00% 60.00%
1917 0.00% 40.00%
1918 7.60% 0.00%
1919 4.00% 58.90%
1920 0.00% 3.70%
1921 6.00% 9.60%
1922 17.30% 2.00%
1923 7.80% 0.00%
1924 0.00% 28.90%
1925 2.00% 1.90%
1926 13.90% 3.80%
1927 1.90% 3.90%
1928 0.00% 6.00%
1929 0.00% 15.40%
1930 0.00% 13.40%
1931 6.00% 0.00%
1932 0.00% 5.90%
1933 2.00% 16.90%
1934 0.00% 1.90%
1935 0.00% 15.30%
1936 25.60% 0.00%
1937 2.00% 0.00%
1938 0.00% 7.70%
1939 0.00% 3.70%
1940 6.00% 0.00%
1941 38.30% 0.00%
1942 9.50% 4.00%
1943 0.00% 40.70%
1944 0.00% 27.50%
1945 1.90% 22.90%
1946 0.00% 3.70%
1947 2.00% 11.80%
1948 0.00% 0.00%
1949 0.00% 28.30%
1950 0.00% 0.00%
1951 0.00% 19.20%
1952 0.00% 5.60%
1953 0.00% 26.80%
1954 0.00% 55.20%
1955 0.00% 26.70%
1956 0.00% 4.00%
1957 0.00% 25.00%
1958 74.30% 0.00%
1959 0.00% 11.30%
1960 0.00% 1.90%
1961 56.00% 0.00%
1962 0.00% 44.10%
1963 0.00% 8.00%
1964 0.00% 17.10%
1965 0.00% 0.00%
1966 0.00% 13.50%
1967 15.50% 0.00%
1968 2.00% 0.00%
1969 0.00% 2.00%
1970 15.50% 2.00%
1971 6.00% 0.00%
1972 7.90% 0.00%
1973 0.00% 1.90%
1974 0.00% 0.00%
1975 0.00% 0.00%
1976 0.00% 19.10%
1977 31.10% 0.00%
1978 9.80% 2.00%
1979 0.00% 0.00%
1980 0.00% 24.90%
1981 0.00% 0.00%
1982 5.80% 0.00%
1983 5.90% 0.00%
1984 7.90% 5.80%
1985 6.00% 0.00%
1986 9.80% 0.00%
1987 0.00% 1.90%
1988 7.90% 1.90%
1989 2.00% 0.00%
1990 59.10% 0.00%
1991 1.90% 2.00%
1992 51.10% 2.00%
1993 7.50% 27.80%
1994 3.80% 2.00%
1995 0.00% 12.00%
1996 2.00% 0.00%
1997 19.00% 0.00%
1998 74.10% 0.00%
1999 1.90% 2.00%
2000 0.00% 5.80%
2001 3.80% 0.00%
2002 9.70% 0.00%
2003 58.10% 0.00%
2004 72.50% 0.00%
2005 5.90% 2.00%
2006 38.70% 0.00%
2007 34.70% 0.00%
2008 0.00% 7.60%
2009 56.80% 0.00%
2010 0.00% 6.00%
2011 0.00% 0.00%
2012 5.90% 0.00%
2013 78.70% 0.00%
2014 80.60% 0.00%

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.