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 8.20% 9.90%
1911 6.80% 8.80%
1912 0.20% 42.90%
1913 16.00% 12.70%
1914 12.60% 13.20%
1915 0.90% 51.80%
1916 0.20% 14.50%
1917 6.50% 6.30%
1918 15.90% 2.50%
1919 15.50% 8.70%
1920 0.60% 20.30%
1921 13.50% 9.00%
1922 7.10% 1.80%
1923 1.20% 20.70%
1924 7.70% 14.80%
1925 12.10% 5.80%
1926 7.20% 5.50%
1927 0.70% 41.60%
1928 1.10% 23.70%
1929 2.20% 2.50%
1930 19.30% 1.40%
1931 26.70% 1.40%
1932 5.80% 2.10%
1933 31.00% 1.40%
1934 41.20% 0.80%
1935 3.50% 0.80%
1936 49.80% 0.00%
1937 12.50% 0.00%
1938 7.60% 1.60%
1939 6.30% 0.00%
1940 18.40% 8.60%
1941 0.90% 16.70%
1942 1.00% 2.20%
1943 18.10% 6.20%
1944 9.50% 13.50%
1945 0.40% 20.60%
1946 0.40% 5.60%
1947 1.00% 10.40%
1948 3.10% 3.90%
1949 10.70% 2.30%
1950 0.80% 29.60%
1951 6.90% 28.00%
1952 30.00% 0.70%
1953 14.90% 6.10%
1954 29.00% 11.80%
1955 8.30% 6.40%
1956 9.20% 1.00%
1957 1.10% 3.40%
1958 8.00% 11.00%
1959 9.30% 0.70%
1960 12.60% 0.50%
1961 23.40% 16.00%
1962 1.00% 3.40%
1963 1.20% 10.50%
1964 1.30% 7.60%
1965 0.00% 26.10%
1966 1.60% 2.30%
1967 7.10% 31.60%
1968 0.20% 11.60%
1969 0.60% 0.10%
1970 8.70% 0.30%
1971 0.50% 1.10%
1972 0.60% 13.80%
1973 1.70% 2.40%
1974 1.40% 8.60%
1975 0.70% 11.50%
1976 6.80% 19.60%
1977 4.50% 0.60%
1978 2.00% 0.30%
1979 1.00% 10.00%
1980 31.20% 10.00%
1981 7.90% 0.80%
1982 0.20% 18.10%
1983 15.50% 10.20%
1984 1.90% 5.10%
1985 5.90% 9.20%
1986 3.30% 3.70%
1987 5.50% 1.90%
1988 37.10% 1.90%
1989 1.10% 15.00%
1990 2.30% 0.70%
1991 4.80% 5.20%
1992 2.70% 56.50%
1993 5.30% 33.70%
1994 21.80% 5.80%
1995 8.50% 4.90%
1996 13.10% 2.60%
1997 1.00% 9.00%
1998 15.80% 0.80%
1999 5.00% 3.20%
2000 17.70% 3.90%
2001 12.30% 1.20%
2002 30.20% 0.40%
2003 30.00% 3.90%
2004 3.70% 40.30%
2005 11.10% 0.00%
2006 33.90% 0.20%
2007 30.70% 4.90%
2008 8.40% 0.80%
2009 4.50% 24.70%
2010 13.90% 1.60%
2011 36.40% 1.90%
2012 48.50% 0.40%
2013 18.40% 7.10%
2014 7.50% 9.80%

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.