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 43.90% 0.00%
1911 24.40% 1.40%
1912 5.60% 19.70%
1913 0.00% 25.70%
1914 11.10% 0.00%
1915 6.70% 5.80%
1916 4.40% 2.70%
1917 0.00% 89.90%
1918 5.80% 1.30%
1919 17.20% 0.00%
1920 0.00% 28.00%
1921 5.80% 0.00%
1922 0.00% 44.40%
1923 0.00% 17.80%
1924 0.00% 32.30%
1925 28.50% 0.00%
1926 31.20% 0.00%
1927 2.90% 4.20%
1928 16.80% 1.50%
1929 0.00% 16.70%
1930 2.60% 2.90%
1931 0.00% 15.20%
1932 0.00% 10.00%
1933 0.00% 56.40%
1934 74.50% 0.00%
1935 0.00% 0.00%
1936 5.80% 0.00%
1937 1.40% 0.00%
1938 1.30% 3.00%
1939 7.20% 0.00%
1940 23.60% 0.00%
1941 7.00% 0.00%
1942 0.00% 35.00%
1943 7.20% 0.00%
1944 0.00% 27.10%
1945 0.00% 25.40%
1946 8.40% 1.40%
1947 6.90% 0.00%
1948 0.00% 17.00%
1949 1.30% 1.40%
1950 0.00% 19.30%
1951 0.00% 5.40%
1952 0.00% 4.10%
1953 0.00% 22.40%
1954 1.50% 1.40%
1955 0.00% 40.20%
1956 0.00% 2.90%
1957 0.00% 1.40%
1958 0.00% 1.40%
1959 0.00% 1.30%
1960 0.00% 0.00%
1961 0.00% 0.00%
1962 0.00% 5.60%
1963 4.20% 5.60%
1964 0.00% 41.90%
1965 0.00% 25.70%
1966 0.00% 0.00%
1967 4.40% 2.90%
1968 0.00% 11.20%
1969 0.00% 8.60%
1970 0.00% 46.90%
1971 0.00% 35.90%
1972 1.40% 1.50%
1973 0.00% 18.70%
1974 8.60% 1.50%
1975 0.00% 63.90%
1976 0.00% 1.40%
1977 2.70% 22.80%
1978 10.90% 0.00%
1979 0.00% 0.00%
1980 0.00% 11.50%
1981 19.40% 0.00%
1982 0.00% 2.70%
1983 0.00% 11.60%
1984 0.00% 4.20%
1985 15.60% 0.00%
1986 37.60% 0.00%
1987 4.00% 2.90%
1988 1.30% 1.50%
1989 64.80% 0.00%
1990 34.80% 0.00%
1991 4.20% 17.40%
1992 76.60% 0.00%
1993 7.00% 0.00%
1994 29.00% 0.00%
1995 0.00% 1.50%
1996 11.60% 0.00%
1997 13.20% 1.30%
1998 0.00% 14.40%
1999 2.80% 1.30%
2000 65.20% 0.00%
2001 47.50% 0.00%
2002 1.50% 2.80%
2003 17.90% 0.00%
2004 87.40% 0.00%
2005 2.90% 0.00%
2006 21.50% 0.00%
2007 40.90% 0.00%
2008 0.00% 20.60%
2009 21.70% 0.00%
2010 0.00% 8.20%
2011 10.00% 1.30%
2012 46.10% 0.00%
2013 17.60% 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.