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% 16.20%
1911 15.70% 0.00%
1912 0.00% 19.90%
1913 68.70% 0.00%
1914 60.80% 0.00%
1915 0.00% 87.90%
1916 0.00% 1.40%
1917 0.00% 9.20%
1918 21.00% 0.00%
1919 12.90% 0.00%
1920 0.00% 20.00%
1921 37.70% 0.00%
1922 0.00% 0.00%
1923 2.50% 1.30%
1924 0.00% 19.30%
1925 9.60% 0.00%
1926 0.00% 1.30%
1927 0.00% 76.10%
1928 0.00% 25.20%
1929 0.00% 5.20%
1930 55.80% 0.00%
1931 22.00% 0.00%
1932 6.80% 0.00%
1933 46.60% 0.00%
1934 85.20% 0.00%
1935 0.00% 4.00%
1936 94.70% 0.00%
1937 0.00% 0.00%
1938 0.00% 0.00%
1939 0.00% 0.00%
1940 0.00% 1.40%
1941 2.60% 0.00%
1942 0.00% 0.00%
1943 20.20% 0.00%
1944 40.70% 0.00%
1945 0.00% 17.10%
1946 0.00% 6.70%
1947 0.00% 0.00%
1948 0.00% 1.30%
1949 10.30% 0.00%
1950 0.00% 74.10%
1951 0.00% 28.40%
1952 53.30% 0.00%
1953 62.10% 0.00%
1954 46.90% 0.00%
1955 2.50% 0.00%
1956 0.00% 0.00%
1957 0.00% 0.00%
1958 0.00% 49.10%
1959 2.60% 0.00%
1960 0.00% 0.00%
1961 0.00% 12.10%
1962 0.00% 0.00%
1963 1.30% 2.70%
1964 0.00% 0.00%
1965 0.00% 1.30%
1966 0.00% 0.00%
1967 0.00% 58.60%
1968 0.00% 0.00%
1969 0.00% 0.00%
1970 0.00% 0.00%
1971 0.00% 1.30%
1972 0.00% 28.80%
1973 0.00% 0.00%
1974 0.00% 16.10%
1975 0.00% 0.00%
1976 0.00% 9.40%
1977 0.00% 0.00%
1978 0.00% 0.00%
1979 0.00% 17.40%
1980 32.10% 0.00%
1981 0.00% 1.30%
1982 0.00% 44.40%
1983 40.30% 0.00%
1984 0.00% 0.00%
1985 0.00% 31.50%
1986 0.00% 0.00%
1987 7.90% 0.00%
1988 66.30% 0.00%
1989 0.00% 9.50%
1990 0.00% 5.20%
1991 11.70% 0.00%
1992 0.00% 93.40%
1993 1.40% 3.90%
1994 0.00% 0.00%
1995 9.10% 0.00%
1996 0.00% 1.30%
1997 0.00% 23.40%
1998 0.00% 0.00%
1999 10.60% 0.00%
2000 0.00% 2.60%
2001 0.00% 0.00%
2002 13.00% 0.00%
2003 0.00% 6.80%
2004 0.00% 82.70%
2005 14.20% 0.00%
2006 2.70% 0.00%
2007 12.30% 0.00%
2008 0.00% 0.00%
2009 0.00% 58.60%
2010 16.20% 0.00%
2011 6.70% 0.00%
2012 62.80% 0.00%
2013 0.00% 18.80%

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.