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 8.30% 1.00%
1911 0.00% 28.90%
1912 0.00% 33.80%
1913 0.00% 20.50%
1914 1.10% 0.00%
1915 6.00% 5.40%
1916 0.00% 89.50%
1917 0.00% 72.20%
1918 1.00% 1.10%
1919 0.00% 10.10%
1920 1.00% 0.00%
1921 29.60% 0.00%
1922 1.00% 18.10%
1923 3.10% 4.30%
1924 0.00% 55.90%
1925 23.60% 0.00%
1926 12.40% 0.00%
1927 1.10% 17.20%
1928 0.00% 3.10%
1929 0.00% 63.20%
1930 0.00% 4.10%
1931 45.20% 0.00%
1932 0.00% 10.60%
1933 5.30% 0.00%
1934 65.20% 0.00%
1935 0.00% 4.00%
1936 0.00% 15.10%
1937 0.00% 7.10%
1938 11.60% 0.00%
1939 5.10% 0.00%
1940 26.90% 0.00%
1941 45.40% 0.00%
1942 0.00% 5.30%
1943 0.00% 5.00%
1944 0.00% 6.40%
1945 0.00% 3.10%
1946 6.40% 0.00%
1947 1.00% 0.00%
1948 0.00% 6.30%
1949 0.00% 26.00%
1950 0.00% 70.00%
1951 0.00% 80.10%
1952 0.00% 9.50%
1953 26.60% 0.00%
1954 7.40% 0.00%
1955 0.00% 32.30%
1956 0.00% 1.10%
1957 0.00% 0.90%
1958 10.80% 0.00%
1959 0.00% 0.00%
1960 0.00% 10.70%
1961 1.00% 0.00%
1962 0.00% 1.10%
1963 6.30% 0.00%
1964 0.00% 11.80%
1965 0.00% 8.90%
1966 0.00% 14.70%
1967 4.10% 1.10%
1968 0.00% 3.30%
1969 0.00% 6.00%
1970 0.00% 1.00%
1971 0.00% 1.10%
1972 0.00% 1.00%
1973 3.10% 3.20%
1974 0.00% 0.00%
1975 0.00% 7.10%
1976 0.00% 2.10%
1977 3.20% 0.00%
1978 0.00% 42.10%
1979 0.00% 35.40%
1980 3.10% 0.00%
1981 65.70% 0.00%
1982 0.00% 10.00%
1983 10.30% 0.00%
1984 1.00% 5.40%
1985 0.00% 47.80%
1986 45.50% 0.00%
1987 55.30% 0.00%
1988 4.00% 0.00%
1989 0.00% 7.60%
1990 1.90% 1.10%
1991 26.60% 0.00%
1992 12.80% 0.00%
1993 0.00% 16.80%
1994 9.50% 0.00%
1995 8.30% 0.00%
1996 0.00% 39.60%
1997 3.90% 1.10%
1998 82.40% 0.00%
1999 68.80% 0.00%
2000 3.30% 0.00%
2001 32.70% 0.00%
2002 1.00% 1.10%
2003 24.00% 0.00%
2004 16.20% 0.00%
2005 38.70% 0.00%
2006 69.70% 0.00%
2007 43.30% 0.00%
2008 0.00% 4.20%
2009 0.00% 1.10%
2010 13.40% 0.00%
2011 6.00% 1.10%
2012 79.60% 0.00%
2013 8.10% 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.