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 99.00% 0.00%
1911 21.00% 0.00%
1912 0.00% 46.80%
1913 0.00% 4.00%
1914 2.00% 0.00%
1915 3.90% 24.70%
1916 0.00% 5.00%
1917 0.00% 80.60%
1918 6.50% 0.00%
1919 2.10% 2.00%
1920 0.00% 73.00%
1921 9.80% 0.00%
1922 0.00% 22.70%
1923 0.00% 7.40%
1924 0.90% 34.50%
1925 25.00% 0.00%
1926 17.00% 0.00%
1927 0.00% 11.20%
1928 0.00% 0.00%
1929 0.00% 6.40%
1930 2.00% 0.00%
1931 0.00% 0.00%
1932 0.00% 3.10%
1933 0.00% 4.30%
1934 99.00% 0.00%
1935 0.00% 31.10%
1936 5.10% 0.00%
1937 0.00% 0.00%
1938 0.00% 0.00%
1939 28.70% 0.00%
1940 18.50% 0.00%
1941 9.80% 0.00%
1942 0.00% 0.00%
1943 0.00% 1.00%
1944 0.00% 19.50%
1945 0.00% 1.10%
1946 43.30% 0.00%
1947 3.90% 13.90%
1948 0.00% 3.90%
1949 5.10% 0.00%
1950 0.00% 56.90%
1951 0.00% 28.90%
1952 0.00% 3.30%
1953 0.00% 5.20%
1954 0.00% 8.80%
1955 18.20% 26.10%
1956 0.00% 3.00%
1957 0.00% 19.40%
1958 1.90% 9.90%
1959 0.00% 0.00%
1960 0.00% 16.00%
1961 0.00% 2.20%
1962 0.00% 0.00%
1963 1.10% 0.00%
1964 0.00% 13.30%
1965 0.00% 46.60%
1966 1.00% 0.00%
1967 0.00% 15.60%
1968 0.00% 0.00%
1969 0.00% 0.00%
1970 0.00% 35.50%
1971 0.00% 1.00%
1972 2.20% 0.00%
1973 0.00% 7.50%
1974 2.10% 1.90%
1975 0.00% 70.00%
1976 0.00% 0.00%
1977 39.80% 0.00%
1978 0.00% 0.00%
1979 0.00% 14.80%
1980 19.80% 1.10%
1981 42.90% 0.00%
1982 0.00% 5.00%
1983 0.00% 30.30%
1984 0.00% 16.10%
1985 60.10% 0.00%
1986 18.70% 0.00%
1987 58.80% 0.00%
1988 46.60% 0.00%
1989 5.40% 0.00%
1990 1.10% 0.00%
1991 1.00% 0.00%
1992 68.80% 0.00%
1993 0.00% 3.30%
1994 55.70% 0.00%
1995 0.00% 34.00%
1996 0.00% 35.50%
1997 0.00% 3.00%
1998 1.00% 0.00%
1999 0.00% 0.00%
2000 43.90% 0.00%
2001 10.20% 0.00%
2002 0.00% 30.80%
2003 0.00% 0.00%
2004 41.90% 0.00%
2005 0.90% 0.00%
2006 17.00% 0.00%
2007 43.90% 0.00%
2008 0.00% 2.10%
2009 0.00% 1.00%
2010 1.00% 0.00%
2011 0.00% 29.40%
2012 88.30% 0.00%
2013 1.10% 16.30%
2014 1.10% 1.00%

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.