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 3.80% 5.10%
1911 24.50% 10.00%
1912 0.60% 54.00%
1913 1.00% 24.10%
1914 3.90% 5.80%
1915 1.40% 9.30%
1916 1.60% 21.40%
1917 0.20% 66.40%
1918 1.70% 26.20%
1919 3.20% 4.90%
1920 0.60% 21.50%
1921 47.80% 1.60%
1922 8.00% 17.30%
1923 1.20% 12.00%
1924 0.00% 54.50%
1925 16.40% 0.10%
1926 5.60% 7.50%
1927 14.40% 1.60%
1928 1.20% 3.30%
1929 0.50% 40.80%
1930 0.90% 2.10%
1931 18.90% 4.90%
1932 8.70% 5.00%
1933 17.20% 17.10%
1934 26.40% 2.40%
1935 4.40% 1.60%
1936 3.20% 7.20%
1937 0.90% 15.40%
1938 27.10% 0.20%
1939 2.10% 0.70%
1940 17.50% 36.80%
1941 10.20% 2.10%
1942 0.10% 17.40%
1943 1.00% 5.90%
1944 1.20% 12.90%
1945 3.90% 1.30%
1946 4.20% 1.70%
1947 0.20% 8.30%
1948 0.20% 11.60%
1949 12.30% 25.00%
1950 2.10% 32.80%
1951 0.10% 18.20%
1952 1.80% 1.80%
1953 4.00% 1.30%
1954 10.90% 1.20%
1955 1.70% 25.60%
1956 0.00% 3.10%
1957 7.70% 0.90%
1958 12.10% 7.80%
1959 0.70% 0.20%
1960 0.60% 12.40%
1961 4.70% 7.80%
1962 0.00% 5.30%
1963 0.80% 19.20%
1964 0.00% 19.40%
1965 0.00% 16.60%
1966 0.00% 13.40%
1967 1.80% 6.40%
1968 0.00% 17.60%
1969 1.30% 6.00%
1970 0.30% 2.80%
1971 0.00% 14.00%
1972 0.20% 2.80%
1973 12.50% 7.70%
1974 0.90% 2.20%
1975 0.30% 13.30%
1976 0.50% 5.10%
1977 2.40% 1.50%
1978 6.90% 28.40%
1979 0.50% 37.70%
1980 0.40% 0.00%
1981 20.60% 4.30%
1982 0.20% 12.60%
1983 23.80% 5.80%
1984 4.70% 11.60%
1985 0.00% 5.70%
1986 34.80% 0.20%
1987 25.90% 2.50%
1988 0.20% 11.70%
1989 2.10% 1.80%
1990 39.30% 0.00%
1991 36.60% 0.80%
1992 22.60% 0.00%
1993 1.30% 5.90%
1994 10.10% 2.20%
1995 6.70% 0.00%
1996 8.10% 5.20%
1997 10.80% 0.50%
1998 73.50% 0.00%
1999 20.10% 0.70%
2000 43.80% 0.00%
2001 12.10% 0.00%
2002 19.80% 0.40%
2003 27.20% 0.00%
2004 13.90% 0.00%
2005 34.40% 0.00%
2006 51.00% 0.00%
2007 23.20% 0.00%
2008 0.80% 2.60%
2009 5.30% 0.40%
2010 24.90% 0.80%
2011 12.90% 0.50%
2012 77.50% 0.00%
2013 13.70% 0.40%
2014 21.30% 20.30%

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.