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 27.50% 0.90%
1911 5.50% 8.80%
1912 2.50% 24.50%
1913 0.30% 13.90%
1914 5.40% 3.40%
1915 9.60% 9.30%
1916 0.60% 6.30%
1917 0.00% 65.60%
1918 6.50% 5.90%
1919 2.70% 1.40%
1920 0.00% 28.10%
1921 26.60% 1.40%
1922 11.20% 20.60%
1923 0.20% 35.10%
1924 0.00% 41.80%
1925 16.50% 0.50%
1926 13.80% 35.30%
1927 13.60% 3.20%
1928 5.10% 9.40%
1929 12.00% 6.60%
1930 1.70% 0.50%
1931 3.00% 28.70%
1932 1.20% 12.40%
1933 1.00% 14.40%
1934 33.90% 3.70%
1935 9.80% 10.60%
1936 3.40% 0.10%
1937 0.60% 2.30%
1938 21.00% 0.40%
1939 2.50% 1.80%
1940 15.90% 17.90%
1941 9.60% 4.90%
1942 5.80% 8.70%
1943 1.80% 21.90%
1944 0.00% 7.80%
1945 12.00% 7.80%
1946 29.90% 0.40%
1947 7.00% 24.80%
1948 7.20% 9.60%
1949 1.70% 0.20%
1950 0.00% 36.30%
1951 0.00% 24.80%
1952 0.00% 7.60%
1953 6.00% 8.00%
1954 0.60% 9.80%
1955 13.10% 25.40%
1956 0.00% 10.80%
1957 5.50% 0.20%
1958 0.60% 2.10%
1959 0.50% 1.50%
1960 0.00% 37.60%
1961 0.80% 1.50%
1962 0.10% 1.50%
1963 12.70% 1.10%
1964 0.00% 19.10%
1965 0.20% 17.10%
1966 0.50% 0.90%
1967 7.50% 11.90%
1968 0.00% 4.10%
1969 0.00% 12.20%
1970 0.00% 14.80%
1971 0.00% 37.20%
1972 1.70% 2.20%
1973 10.30% 4.50%
1974 15.40% 0.60%
1975 0.00% 24.70%
1976 0.00% 4.80%
1977 36.10% 7.20%
1978 5.80% 0.70%
1979 2.20% 1.90%
1980 0.90% 8.70%
1981 13.10% 0.80%
1982 0.40% 3.70%
1983 2.50% 18.30%
1984 0.40% 8.10%
1985 37.80% 0.00%
1986 34.30% 1.00%
1987 35.80% 3.40%
1988 2.00% 7.90%
1989 18.90% 0.40%
1990 9.10% 0.00%
1991 54.50% 3.40%
1992 35.20% 2.80%
1993 16.10% 7.50%
1994 17.20% 0.30%
1995 3.20% 0.80%
1996 3.10% 18.10%
1997 10.40% 12.70%
1998 22.70% 2.80%
1999 7.00% 2.40%
2000 35.60% 0.00%
2001 14.60% 0.00%
2002 2.30% 15.10%
2003 14.70% 0.40%
2004 58.10% 0.00%
2005 7.40% 3.50%
2006 29.80% 0.00%
2007 35.20% 0.30%
2008 0.00% 7.70%
2009 3.70% 1.00%
2010 30.00% 4.40%
2011 10.00% 1.30%
2012 70.80% 0.00%
2013 6.40% 18.10%

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.