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 11.00% 8.50%
1911 0.00% 19.70%
1912 0.00% 52.70%
1913 0.00% 36.00%
1914 0.00% 22.60%
1915 2.70% 0.00%
1916 0.00% 27.80%
1917 25.00% 2.80%
1918 16.80% 0.00%
1919 25.00% 0.00%
1920 2.90% 2.80%
1921 8.50% 0.00%
1922 5.40% 0.00%
1923 0.00% 61.40%
1924 8.20% 8.40%
1925 0.00% 8.50%
1926 41.30% 0.00%
1927 0.00% 8.60%
1928 8.40% 5.80%
1929 8.60% 0.00%
1930 5.70% 0.00%
1931 47.40% 0.00%
1932 2.90% 5.60%
1933 19.20% 5.80%
1934 0.00% 0.00%
1935 16.60% 0.00%
1936 14.10% 0.00%
1937 2.70% 0.00%
1938 10.70% 3.00%
1939 8.00% 0.00%
1940 29.90% 2.80%
1941 0.00% 33.50%
1942 0.00% 0.00%
1943 0.00% 30.40%
1944 0.00% 50.20%
1945 2.80% 5.70%
1946 0.00% 0.00%
1947 2.80% 32.60%
1948 0.00% 14.00%
1949 0.00% 0.00%
1950 8.50% 0.00%
1951 2.70% 11.30%
1952 0.00% 5.70%
1953 0.00% 32.70%
1954 0.00% 29.90%
1955 0.00% 0.00%
1956 0.00% 0.00%
1957 8.60% 0.00%
1958 0.00% 0.00%
1959 36.60% 0.00%
1960 55.30% 0.00%
1961 57.90% 0.00%
1962 0.00% 3.00%
1963 0.00% 57.90%
1964 0.00% 0.00%
1965 0.00% 80.80%
1966 0.00% 0.00%
1967 7.90% 2.80%
1968 0.00% 13.90%
1969 0.00% 0.00%
1970 5.40% 0.00%
1971 0.00% 0.00%
1972 5.60% 0.00%
1973 0.00% 0.00%
1974 0.00% 0.00%
1975 0.00% 16.70%
1976 2.80% 60.40%
1977 5.40% 0.00%
1978 2.90% 0.00%
1979 3.00% 0.00%
1980 0.00% 33.20%
1981 53.40% 0.00%
1982 0.00% 39.20%
1983 5.70% 46.60%
1984 5.60% 2.80%
1985 25.00% 0.00%
1986 2.70% 0.00%
1987 0.00% 8.60%
1988 8.10% 0.00%
1989 0.00% 0.00%
1990 0.00% 0.00%
1991 0.00% 11.50%
1992 0.00% 0.00%
1993 5.60% 40.80%
1994 36.10% 0.00%
1995 0.00% 16.60%
1996 50.40% 0.00%
1997 0.00% 0.00%
1998 0.00% 0.00%
1999 0.00% 11.20%
2000 14.10% 0.00%
2001 22.40% 0.00%
2002 35.90% 0.00%
2003 52.30% 0.00%
2004 8.30% 0.00%
2005 0.00% 2.80%
2006 67.00% 0.00%
2007 53.00% 0.00%
2008 45.40% 0.00%
2009 2.60% 0.00%
2010 0.00% 2.80%
2011 3.00% 14.00%
2012 30.50% 0.00%
2013 38.10% 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.