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 5.80% 9.20%
1911 3.90% 0.00%
1912 1.00% 26.00%
1913 1.80% 12.70%
1914 17.00% 0.00%
1915 1.00% 65.90%
1916 1.00% 1.90%
1917 0.00% 48.30%
1918 6.70% 1.90%
1919 0.00% 15.40%
1920 0.00% 58.60%
1921 10.40% 1.90%
1922 0.90% 1.00%
1923 3.90% 1.00%
1924 7.70% 0.00%
1925 11.60% 0.00%
1926 0.00% 20.00%
1927 0.00% 28.50%
1928 2.00% 15.30%
1929 0.00% 8.70%
1930 0.00% 16.50%
1931 0.00% 15.70%
1932 10.50% 1.00%
1933 10.00% 4.00%
1934 72.70% 0.00%
1935 5.50% 1.90%
1936 35.60% 2.00%
1937 22.90% 0.90%
1938 6.30% 0.00%
1939 1.00% 0.00%
1940 0.90% 29.90%
1941 1.00% 15.40%
1942 1.90% 7.70%
1943 43.80% 0.90%
1944 0.90% 0.90%
1945 0.00% 23.90%
1946 0.00% 6.80%
1947 0.00% 3.80%
1948 1.00% 1.90%
1949 2.80% 4.80%
1950 0.00% 34.90%
1951 12.60% 1.80%
1952 49.50% 0.00%
1953 21.10% 0.00%
1954 60.50% 0.00%
1955 0.00% 12.60%
1956 4.70% 3.00%
1957 1.00% 0.00%
1958 3.90% 0.90%
1959 0.00% 1.00%
1960 0.00% 0.00%
1961 0.00% 61.20%
1962 1.00% 2.80%
1963 12.70% 0.00%
1964 1.00% 0.00%
1965 0.00% 2.00%
1966 0.00% 10.70%
1967 0.00% 45.50%
1968 0.00% 10.80%
1969 2.90% 0.00%
1970 0.00% 5.80%
1971 0.00% 2.00%
1972 0.00% 20.10%
1973 0.00% 28.80%
1974 0.00% 47.60%
1975 0.00% 12.50%
1976 0.00% 74.50%
1977 12.40% 0.00%
1978 0.90% 0.00%
1979 0.00% 13.20%
1980 63.70% 0.00%
1981 12.60% 1.00%
1982 1.00% 0.00%
1983 0.90% 4.80%
1984 0.00% 8.70%
1985 1.00% 9.10%
1986 1.00% 0.00%
1987 2.90% 1.00%
1988 1.80% 0.90%
1989 0.00% 17.00%
1990 1.00% 0.00%
1991 1.80% 2.00%
1992 0.00% 59.30%
1993 28.80% 1.90%
1994 6.80% 0.00%
1995 0.00% 1.90%
1996 13.80% 0.00%
1997 1.00% 2.90%
1998 65.30% 0.00%
1999 21.20% 0.00%
2000 14.20% 0.00%
2001 31.30% 0.00%
2002 29.50% 0.00%
2003 9.70% 0.00%
2004 0.00% 32.20%
2005 9.70% 0.90%
2006 21.40% 0.00%
2007 17.70% 1.00%
2008 13.70% 0.00%
2009 12.80% 2.80%
2010 89.60% 0.00%
2011 96.30% 0.00%
2012 22.90% 0.00%
2013 8.60% 0.00%
2014 5.90% 1.80%

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.