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 1.10% 18.40%
1911 0.00% 12.20%
1912 1.10% 21.00%
1913 7.40% 2.00%
1914 1.10% 6.00%
1915 0.00% 78.00%
1916 1.10% 18.40%
1917 1.00% 53.20%
1918 6.00% 2.10%
1919 23.20% 3.90%
1920 1.00% 11.70%
1921 31.80% 0.00%
1922 15.40% 0.00%
1923 12.20% 1.00%
1924 0.00% 67.80%
1925 2.10% 5.10%
1926 5.20% 7.10%
1927 1.10% 32.60%
1928 0.00% 48.00%
1929 3.10% 5.10%
1930 7.10% 0.00%
1931 27.80% 1.00%
1932 16.20% 1.10%
1933 39.10% 1.00%
1934 16.20% 3.00%
1935 3.20% 9.00%
1936 86.00% 0.00%
1937 21.70% 0.00%
1938 7.30% 0.00%
1939 1.10% 6.30%
1940 18.60% 0.00%
1941 31.20% 0.00%
1942 0.00% 9.30%
1943 4.30% 9.90%
1944 0.00% 22.60%
1945 0.00% 23.00%
1946 0.00% 0.00%
1947 1.10% 3.10%
1948 1.00% 1.00%
1949 1.10% 3.10%
1950 0.00% 83.10%
1951 0.00% 53.20%
1952 1.10% 8.80%
1953 1.10% 1.90%
1954 9.80% 2.00%
1955 9.30% 0.00%
1956 1.10% 1.10%
1957 3.10% 0.90%
1958 4.90% 14.10%
1959 1.10% 1.00%
1960 0.00% 0.00%
1961 36.50% 0.00%
1962 0.00% 19.80%
1963 20.10% 2.00%
1964 0.00% 1.00%
1965 1.90% 1.10%
1966 0.00% 4.90%
1967 3.00% 24.20%
1968 0.00% 9.00%
1969 0.00% 9.00%
1970 11.00% 0.00%
1971 1.00% 0.00%
1972 2.00% 0.00%
1973 1.00% 1.00%
1974 1.00% 4.10%
1975 1.10% 3.20%
1976 1.10% 4.30%
1977 10.70% 2.00%
1978 0.00% 13.50%
1979 0.00% 3.20%
1980 5.50% 6.00%
1981 0.00% 1.00%
1982 0.00% 2.90%
1983 38.30% 0.00%
1984 5.80% 0.00%
1985 0.00% 22.60%
1986 3.10% 1.00%
1987 1.10% 2.10%
1988 55.20% 1.00%
1989 4.80% 0.00%
1990 4.80% 0.00%
1991 32.80% 0.00%
1992 1.90% 62.20%
1993 0.00% 50.30%
1994 1.10% 1.10%
1995 10.00% 5.20%
1996 1.00% 1.10%
1997 15.20% 0.00%
1998 11.80% 0.00%
1999 1.10% 0.00%
2000 5.40% 0.00%
2001 24.10% 0.00%
2002 25.60% 0.00%
2003 39.60% 0.00%
2004 5.80% 44.70%
2005 12.60% 2.00%
2006 51.60% 0.00%
2007 73.60% 0.00%
2008 1.00% 6.20%
2009 1.00% 22.50%
2010 21.10% 1.00%
2011 38.80% 2.00%
2012 33.60% 1.00%
2013 34.00% 1.00%
2014 13.80% 0.00%

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.