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 10.00% 1.60%
1911 21.80% 6.80%
1912 0.00% 64.90%
1913 6.70% 17.70%
1914 2.20% 3.60%
1915 0.50% 38.20%
1916 1.80% 16.70%
1917 0.40% 47.60%
1918 3.70% 0.90%
1919 6.40% 14.40%
1920 0.70% 30.20%
1921 38.50% 0.30%
1922 0.20% 16.40%
1923 0.00% 9.60%
1924 4.00% 31.00%
1925 29.90% 0.20%
1926 17.00% 10.60%
1927 6.70% 5.20%
1928 1.80% 2.80%
1929 0.30% 18.00%
1930 10.50% 0.60%
1931 28.70% 4.10%
1932 12.20% 5.20%
1933 18.80% 8.90%
1934 64.10% 0.40%
1935 0.70% 0.80%
1936 7.10% 1.60%
1937 1.10% 11.80%
1938 13.30% 1.20%
1939 8.50% 0.00%
1940 13.00% 36.70%
1941 3.80% 14.10%
1942 0.00% 6.00%
1943 13.10% 1.90%
1944 5.50% 12.10%
1945 1.60% 1.90%
1946 13.80% 0.20%
1947 0.00% 5.30%
1948 0.20% 8.80%
1949 10.90% 18.70%
1950 1.60% 22.90%
1951 1.20% 15.80%
1952 15.70% 5.50%
1953 19.30% 1.40%
1954 33.90% 3.10%
1955 5.00% 19.70%
1956 4.10% 3.80%
1957 0.80% 4.80%
1958 5.40% 36.70%
1959 4.20% 0.70%
1960 0.00% 27.80%
1961 11.00% 5.60%
1962 0.00% 3.60%
1963 1.60% 2.90%
1964 1.30% 11.10%
1965 0.00% 15.90%
1966 0.40% 11.20%
1967 1.30% 1.20%
1968 0.20% 10.30%
1969 0.00% 7.40%
1970 0.20% 3.70%
1971 0.00% 4.70%
1972 5.20% 2.50%
1973 1.60% 18.90%
1974 2.60% 0.40%
1975 0.80% 27.60%
1976 7.90% 0.60%
1977 0.60% 0.20%
1978 0.00% 42.60%
1979 0.00% 58.30%
1980 0.20% 2.00%
1981 18.30% 0.40%
1982 0.00% 21.50%
1983 1.40% 16.30%
1984 4.00% 7.30%
1985 0.20% 1.70%
1986 20.50% 0.00%
1987 24.60% 2.90%
1988 21.00% 0.50%
1989 5.70% 2.20%
1990 14.90% 0.00%
1991 17.90% 0.20%
1992 21.40% 1.00%
1993 0.00% 30.50%
1994 21.90% 1.50%
1995 0.30% 0.30%
1996 12.90% 7.00%
1997 3.40% 3.10%
1998 20.30% 3.70%
1999 13.60% 1.30%
2000 51.00% 0.00%
2001 5.00% 0.00%
2002 27.50% 0.00%
2003 22.80% 5.70%
2004 7.80% 0.30%
2005 6.20% 0.00%
2006 66.70% 0.00%
2007 27.80% 3.70%
2008 3.30% 2.30%
2009 10.90% 1.00%
2010 10.70% 2.00%
2011 23.30% 4.80%
2012 82.60% 0.00%
2013 6.50% 7.10%
2014 17.80% 19.60%

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.