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 7.70% 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 19.20% 2.00%
1923 7.80% 0.00%
1924 0.00% 28.90%
1925 2.00% 1.90%
1926 13.90% 1.90%
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 4.00% 16.90%
1934 0.00% 1.90%
1935 0.00% 15.30%
1936 27.50% 0.00%
1937 2.00% 0.00%
1938 1.90% 7.70%
1939 0.00% 3.70%
1940 6.00% 0.00%
1941 40.10% 0.00%
1942 9.50% 4.00%
1943 0.00% 40.70%
1944 0.00% 27.50%
1945 1.90% 22.90%
1946 1.90% 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 57.90% 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 19.30% 0.00%
1968 2.00% 0.00%
1969 0.00% 2.00%
1970 17.40% 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 34.90% 0.00%
1978 11.60% 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 13.60% 0.00%
1987 0.00% 1.90%
1988 7.90% 1.90%
1989 3.90% 0.00%
1990 62.90% 0.00%
1991 3.80% 2.00%
1992 55.00% 2.00%
1993 9.40% 27.80%
1994 3.80% 2.00%
1995 0.00% 12.00%
1996 2.00% 0.00%
1997 22.80% 0.00%
1998 74.10% 0.00%
1999 1.90% 2.00%
2000 0.00% 5.80%
2001 5.80% 0.00%
2002 9.70% 0.00%
2003 60.10% 0.00%
2004 76.50% 0.00%
2005 11.50% 2.00%
2006 46.40% 0.00%
2007 38.70% 0.00%
2008 0.00% 7.60%
2009 58.70% 0.00%
2010 0.00% 6.00%
2011 0.00% 0.00%
2012 9.90% 0.00%
2013 72.70% 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.