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 27.40% 8.40%
1911 0.00% 61.00%
1912 0.00% 41.90%
1913 2.80% 27.80%
1914 2.90% 0.00%
1915 0.00% 11.50%
1916 0.00% 53.60%
1917 5.60% 5.30%
1918 2.80% 8.50%
1919 8.30% 8.20%
1920 2.90% 36.50%
1921 11.20% 0.00%
1922 0.00% 44.30%
1923 0.00% 13.70%
1924 14.00% 0.00%
1925 0.00% 0.00%
1926 60.50% 0.00%
1927 0.00% 5.70%
1928 11.20% 0.00%
1929 11.30% 0.00%
1930 2.80% 8.10%
1931 31.00% 0.00%
1932 0.00% 8.10%
1933 2.70% 3.00%
1934 68.80% 0.00%
1935 2.90% 2.70%
1936 38.60% 0.00%
1937 0.00% 0.00%
1938 0.00% 16.80%
1939 49.40% 0.00%
1940 22.20% 0.00%
1941 0.00% 11.40%
1942 0.00% 0.00%
1943 2.80% 0.00%
1944 0.00% 33.50%
1945 0.00% 2.70%
1946 0.00% 0.00%
1947 0.00% 0.00%
1948 0.00% 38.00%
1949 0.00% 2.80%
1950 8.40% 0.00%
1951 0.00% 8.40%
1952 0.00% 17.00%
1953 0.00% 2.70%
1954 8.20% 5.50%
1955 0.00% 16.80%
1956 0.00% 2.70%
1957 0.00% 13.50%
1958 36.40% 0.00%
1959 67.20% 0.00%
1960 5.60% 0.00%
1961 2.70% 0.00%
1962 0.00% 3.00%
1963 0.00% 33.40%
1964 0.00% 8.20%
1965 0.00% 39.70%
1966 5.40% 0.00%
1967 0.00% 0.00%
1968 0.00% 0.00%
1969 0.00% 3.00%
1970 2.70% 0.00%
1971 0.00% 44.10%
1972 0.00% 5.50%
1973 0.00% 14.40%
1974 0.00% 2.80%
1975 0.00% 52.20%
1976 5.70% 2.80%
1977 0.00% 0.00%
1978 0.00% 14.10%
1979 0.00% 0.00%
1980 0.00% 0.00%
1981 22.00% 0.00%
1982 0.00% 80.40%
1983 0.00% 46.80%
1984 14.20% 16.20%
1985 0.00% 11.20%
1986 13.70% 0.00%
1987 18.80% 0.00%
1988 32.80% 0.00%
1989 8.50% 0.00%
1990 0.00% 0.00%
1991 2.70% 0.00%
1992 49.00% 0.00%
1993 0.00% 21.70%
1994 0.00% 0.00%
1995 0.00% 0.00%
1996 22.70% 0.00%
1997 25.60% 0.00%
1998 0.00% 58.10%
1999 5.40% 0.00%
2000 14.10% 0.00%
2001 44.00% 0.00%
2002 30.20% 0.00%
2003 44.50% 0.00%
2004 13.60% 0.00%
2005 0.00% 2.70%
2006 17.10% 2.80%
2007 42.20% 0.00%
2008 28.70% 0.00%
2009 14.50% 0.00%
2010 0.00% 11.20%
2011 2.70% 5.70%
2012 58.40% 0.00%
2013 50.20% 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.