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 2.90% 8.50%
1911 45.30% 0.00%
1912 0.00% 78.60%
1913 1.90% 8.50%
1914 0.90% 3.90%
1915 1.00% 16.10%
1916 1.00% 30.20%
1917 0.00% 86.40%
1918 1.00% 9.50%
1919 2.00% 7.50%
1920 0.00% 10.50%
1921 53.00% 0.00%
1922 21.30% 0.00%
1923 6.80% 0.00%
1924 0.00% 72.90%
1925 1.00% 0.00%
1926 0.00% 2.80%
1927 39.70% 0.90%
1928 0.00% 2.90%
1929 0.00% 17.60%
1930 0.00% 1.00%
1931 29.50% 0.00%
1932 0.00% 2.90%
1933 51.60% 1.00%
1934 33.20% 0.00%
1935 10.40% 1.00%
1936 1.00% 11.70%
1937 0.00% 1.90%
1938 33.20% 0.00%
1939 5.60% 0.00%
1940 0.00% 49.90%
1941 30.40% 1.00%
1942 0.00% 11.60%
1943 0.00% 7.60%
1944 1.00% 1.90%
1945 0.00% 5.50%
1946 38.30% 0.00%
1947 0.00% 9.70%
1948 0.00% 5.60%
1949 10.60% 2.80%
1950 1.00% 20.70%
1951 0.00% 21.70%
1952 1.00% 3.90%
1953 4.60% 0.00%
1954 36.40% 0.00%
1955 0.00% 1.90%
1956 0.00% 1.90%
1957 9.60% 0.00%
1958 0.00% 9.60%
1959 0.00% 5.70%
1960 0.00% 16.20%
1961 0.00% 30.00%
1962 0.90% 0.00%
1963 2.60% 18.30%
1964 0.00% 1.00%
1965 1.00% 0.00%
1966 0.00% 32.70%
1967 0.00% 0.00%
1968 0.00% 33.50%
1969 1.00% 4.80%
1970 0.00% 8.70%
1971 0.00% 0.00%
1972 0.00% 0.00%
1973 0.00% 5.80%
1974 0.00% 1.00%
1975 0.00% 17.30%
1976 0.00% 76.30%
1977 2.70% 0.00%
1978 1.90% 25.20%
1979 0.00% 69.00%
1980 0.00% 0.00%
1981 17.60% 0.00%
1982 1.00% 2.70%
1983 0.00% 31.00%
1984 0.00% 0.90%
1985 1.00% 4.50%
1986 57.90% 0.00%
1987 8.00% 4.90%
1988 0.00% 18.20%
1989 0.00% 32.50%
1990 14.70% 0.00%
1991 19.10% 0.00%
1992 0.00% 0.00%
1993 0.00% 7.40%
1994 6.90% 0.00%
1995 0.90% 0.00%
1996 1.00% 7.40%
1997 0.00% 0.90%
1998 94.30% 0.00%
1999 34.70% 0.00%
2000 29.00% 0.00%
2001 39.10% 0.00%
2002 6.70% 0.00%
2003 10.50% 0.00%
2004 42.20% 0.00%
2005 30.60% 0.00%
2006 47.10% 0.00%
2007 30.90% 0.00%
2008 0.00% 1.90%
2009 3.90% 1.80%
2010 10.90% 0.00%
2011 9.60% 1.80%
2012 92.50% 0.00%
2013 0.00% 2.80%

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.