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
1911 7.30% 1.90%
1912 1.30% 33.00%
1913 4.80% 16.10%
1914 0.30% 2.00%
1915 0.20% 23.50%
1916 4.00% 9.00%
1917 1.60% 32.30%
1918 9.00% 38.40%
1919 11.40% 12.30%
1920 2.50% 19.30%
1921 16.80% 0.30%
1922 1.90% 16.50%
1923 11.50% 3.50%
1924 4.70% 2.80%
1925 1.20% 3.20%
1926 8.40% 1.20%
1927 11.40% 0.30%
1928 0.30% 0.90%
1929 0.20% 32.40%
1930 7.90% 0.40%
1931 25.10% 4.20%
1932 37.30% 14.20%
1933 13.50% 27.00%
1934 50.30% 2.60%
1935 7.90% 1.30%
1936 0.50% 55.80%
1937 9.80% 35.30%
1938 1.70% 0.00%
1939 4.40% 3.30%
1940 7.60% 19.40%
1941 8.60% 0.40%
1942 2.20% 1.60%
1943 14.30% 0.10%
1944 11.80% 2.20%
1945 1.00% 3.20%
1946 0.40% 0.80%
1947 2.80% 0.80%
1948 0.00% 5.30%
1949 23.00% 42.70%
1950 32.30% 11.40%
1951 4.60% 0.10%
1952 22.30% 9.40%
1953 21.60% 0.00%
1954 39.40% 0.00%
1955 0.00% 7.10%
1956 0.40% 4.20%
1957 16.00% 0.10%
1958 18.80% 7.80%
1959 13.80% 4.90%
1960 0.00% 4.10%
1961 9.20% 3.40%
1962 0.20% 5.90%
1963 8.80% 23.40%
1964 0.00% 18.30%
1965 0.40% 2.50%
1966 0.00% 8.30%
1967 5.70% 0.30%
1968 0.90% 5.70%
1969 0.20% 23.40%
1970 10.00% 14.50%
1971 5.80% 1.50%
1972 4.30% 3.80%
1973 0.00% 21.50%
1974 5.90% 1.00%
1975 0.90% 0.80%
1976 21.00% 0.00%
1977 8.40% 32.40%
1978 1.90% 56.80%
1979 0.00% 80.70%
1980 1.90% 0.00%
1981 41.20% 0.50%
1982 0.40% 11.90%
1983 22.90% 0.90%
1984 0.00% 23.60%
1985 0.00% 11.00%
1986 11.60% 0.80%
1987 17.80% 1.80%
1988 1.40% 0.80%
1989 0.80% 5.30%
1990 2.10% 0.00%
1991 7.20% 0.60%
1992 39.30% 1.80%
1993 0.00% 22.60%
1994 2.00% 7.60%
1995 18.20% 0.00%
1996 12.30% 0.00%
1997 2.20% 1.40%
1998 21.80% 0.40%
1999 60.10% 0.20%
2000 53.90% 0.00%
2001 0.20% 14.20%
2002 41.60% 0.40%
2003 17.30% 6.50%
2004 0.00% 0.00%
2005 12.40% 0.70%
2006 30.50% 0.00%
2007 1.90% 1.60%
2008 3.90% 3.00%
2009 14.10% 0.20%
2010 2.20% 39.10%
2011 1.40% 3.70%
2012 49.80% 0.00%
2013 6.40% 0.80%
2014 12.60% 13.00%

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.