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 0.00% 45.00%
1911 14.10% 1.60%
1912 0.00% 19.60%
1913 14.30% 3.30%
1914 40.40% 0.00%
1915 3.30% 12.50%
1916 0.00% 19.00%
1917 0.00% 4.60%
1918 4.90% 3.10%
1919 0.00% 10.00%
1920 0.00% 28.40%
1921 6.50% 1.60%
1922 0.00% 14.80%
1923 0.00% 24.90%
1924 13.20% 4.60%
1925 54.50% 1.70%
1926 0.00% 0.00%
1927 5.20% 39.30%
1928 0.00% 1.70%
1929 0.00% 8.00%
1930 28.50% 8.60%
1931 26.10% 0.00%
1932 17.50% 0.00%
1933 0.00% 1.70%
1934 16.00% 0.00%
1935 1.60% 0.00%
1936 43.20% 0.00%
1937 3.20% 0.00%
1938 1.50% 1.70%
1939 1.50% 0.00%
1940 0.00% 1.70%
1941 1.60% 0.00%
1942 6.80% 0.00%
1943 49.50% 0.00%
1944 8.00% 0.00%
1945 0.00% 0.00%
1946 0.00% 27.50%
1947 0.00% 10.00%
1948 1.60% 0.00%
1949 0.00% 6.70%
1950 0.00% 12.70%
1951 19.90% 0.00%
1952 80.60% 0.00%
1953 9.40% 0.00%
1954 74.60% 0.00%
1955 0.00% 1.70%
1956 1.70% 1.50%
1957 0.00% 3.40%
1958 0.00% 1.50%
1959 0.00% 1.70%
1960 1.70% 0.00%
1961 0.00% 32.60%
1962 0.00% 7.80%
1963 0.00% 0.00%
1964 0.00% 13.00%
1965 0.00% 35.90%
1966 1.50% 15.00%
1967 0.00% 85.60%
1968 0.00% 5.10%
1969 0.00% 0.00%
1970 0.00% 1.60%
1971 0.00% 0.00%
1972 0.00% 26.70%
1973 0.00% 0.00%
1974 0.00% 64.10%
1975 0.00% 13.20%
1976 0.00% 21.00%
1977 19.40% 0.00%
1978 0.00% 0.00%
1979 1.70% 37.90%
1980 45.40% 0.00%
1981 11.90% 0.00%
1982 0.00% 9.40%
1983 6.30% 0.00%
1984 0.00% 1.60%
1985 1.70% 3.10%
1986 24.40% 0.00%
1987 33.40% 0.00%
1988 18.70% 1.60%
1989 0.00% 20.90%
1990 18.30% 0.00%
1991 1.50% 8.10%
1992 0.00% 62.40%
1993 43.30% 0.00%
1994 0.00% 32.70%
1995 1.50% 0.00%
1996 0.00% 1.60%
1997 0.00% 40.70%
1998 38.00% 0.00%
1999 6.20% 0.00%
2000 21.60% 1.50%
2001 0.00% 0.00%
2002 23.50% 0.00%
2003 0.00% 31.10%
2004 1.70% 25.80%
2005 0.00% 0.00%
2006 24.40% 1.70%
2007 40.00% 0.00%
2008 7.90% 0.00%
2009 0.00% 4.60%
2010 72.50% 0.00%
2011 76.10% 0.00%
2012 1.50% 1.60%
2013 1.70% 53.20%

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.