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 32.50% 1.40%
1911 0.00% 22.90%
1912 0.00% 80.10%
1913 0.00% 67.00%
1914 0.00% 5.80%
1915 2.70% 47.20%
1916 0.00% 15.20%
1917 1.40% 14.90%
1918 0.00% 15.80%
1919 1.30% 46.30%
1920 0.00% 57.60%
1921 12.50% 0.00%
1922 1.40% 15.40%
1923 0.00% 62.50%
1924 1.50% 8.20%
1925 1.40% 2.80%
1926 5.40% 11.60%
1927 4.20% 0.00%
1928 0.00% 2.70%
1929 0.00% 33.50%
1930 1.40% 15.50%
1931 2.70% 10.30%
1932 0.00% 23.80%
1933 7.00% 2.90%
1934 85.50% 0.00%
1935 1.40% 1.50%
1936 4.20% 0.00%
1937 1.50% 0.00%
1938 0.00% 2.80%
1939 10.80% 0.00%
1940 9.40% 1.50%
1941 0.00% 60.10%
1942 0.00% 4.20%
1943 15.30% 0.00%
1944 0.00% 24.50%
1945 1.40% 5.80%
1946 4.30% 1.50%
1947 0.00% 0.00%
1948 0.00% 2.70%
1949 0.00% 11.40%
1950 44.70% 0.00%
1951 0.00% 6.80%
1952 0.00% 4.10%
1953 2.90% 0.00%
1954 60.20% 0.00%
1955 0.00% 6.90%
1956 11.40% 0.00%
1957 0.00% 15.30%
1958 12.20% 0.00%
1959 1.40% 0.00%
1960 0.00% 5.60%
1961 0.00% 8.40%
1962 0.00% 0.00%
1963 5.50% 0.00%
1964 0.00% 26.50%
1965 0.00% 16.80%
1966 0.00% 0.00%
1967 0.00% 0.00%
1968 0.00% 12.30%
1969 0.00% 2.80%
1970 0.00% 0.00%
1971 0.00% 2.80%
1972 0.00% 0.00%
1973 0.00% 22.30%
1974 0.00% 0.00%
1975 0.00% 30.30%
1976 0.00% 1.50%
1977 13.80% 0.00%
1978 0.00% 0.00%
1979 0.00% 11.20%
1980 0.00% 0.00%
1981 34.50% 0.00%
1982 0.00% 36.20%
1983 0.00% 15.50%
1984 0.00% 35.70%
1985 0.00% 10.80%
1986 2.70% 1.40%
1987 1.30% 8.60%
1988 2.60% 1.40%
1989 42.00% 0.00%
1990 0.00% 0.00%
1991 0.00% 8.50%
1992 5.30% 5.70%
1993 0.00% 16.10%
1994 21.80% 0.00%
1995 7.30% 0.00%
1996 57.20% 0.00%
1997 0.00% 4.30%
1998 4.30% 1.40%
1999 56.30% 0.00%
2000 80.60% 0.00%
2001 36.00% 0.00%
2002 58.70% 0.00%
2003 81.80% 0.00%
2004 0.00% 0.00%
2005 15.30% 0.00%
2006 35.40% 0.00%
2007 56.20% 0.00%
2008 2.80% 0.00%
2009 13.30% 0.00%
2010 0.00% 0.00%
2011 24.60% 0.00%
2012 98.50% 0.00%
2013 0.00% 1.30%

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.