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 4.80% 6.40%
1911 19.00% 18.70%
1912 0.80% 52.20%
1913 1.80% 15.40%
1914 4.60% 5.10%
1915 1.60% 8.80%
1916 1.00% 34.80%
1917 0.00% 73.10%
1918 2.20% 13.10%
1919 5.60% 10.00%
1920 0.40% 16.30%
1921 41.60% 1.00%
1922 6.80% 17.30%
1923 1.30% 11.00%
1924 0.20% 49.70%
1925 10.20% 0.90%
1926 8.20% 10.20%
1927 18.80% 0.90%
1928 1.70% 1.40%
1929 0.80% 47.80%
1930 0.30% 5.00%
1931 28.60% 0.50%
1932 1.40% 4.30%
1933 9.90% 11.10%
1934 36.30% 1.20%
1935 3.70% 5.60%
1936 2.30% 14.10%
1937 0.40% 5.70%
1938 17.40% 0.20%
1939 0.50% 1.90%
1940 16.00% 34.90%
1941 17.30% 1.10%
1942 0.00% 9.00%
1943 0.40% 5.40%
1944 1.00% 9.90%
1945 1.70% 1.30%
1946 5.30% 3.90%
1947 0.20% 3.10%
1948 0.30% 15.70%
1949 12.70% 17.40%
1950 0.60% 29.60%
1951 0.00% 22.80%
1952 0.50% 7.30%
1953 5.50% 1.30%
1954 12.30% 0.50%
1955 0.30% 26.00%
1956 0.00% 3.30%
1957 5.90% 0.80%
1958 11.30% 4.10%
1959 1.00% 6.80%
1960 0.40% 5.40%
1961 1.70% 8.50%
1962 0.20% 1.40%
1963 4.60% 14.20%
1964 0.00% 17.70%
1965 0.00% 11.20%
1966 0.00% 18.00%
1967 2.70% 13.80%
1968 0.30% 14.90%
1969 0.50% 7.70%
1970 0.30% 7.90%
1971 0.00% 4.70%
1972 0.40% 3.20%
1973 19.70% 5.20%
1974 0.30% 1.00%
1975 1.20% 17.20%
1976 0.00% 29.80%
1977 1.70% 0.90%
1978 4.70% 24.10%
1979 0.80% 39.10%
1980 0.40% 0.30%
1981 25.60% 6.50%
1982 0.30% 9.80%
1983 30.30% 3.00%
1984 2.20% 2.90%
1985 1.40% 12.50%
1986 30.30% 0.00%
1987 23.50% 2.40%
1988 1.50% 12.00%
1989 1.60% 2.00%
1990 34.80% 0.20%
1991 21.60% 0.40%
1992 21.50% 0.30%
1993 0.30% 12.10%
1994 5.60% 0.90%
1995 9.30% 0.00%
1996 8.50% 10.80%
1997 11.70% 0.80%
1998 80.90% 0.00%
1999 22.80% 0.40%
2000 30.60% 0.00%
2001 23.90% 0.20%
2002 18.10% 1.10%
2003 29.40% 0.00%
2004 29.20% 0.00%
2005 44.80% 0.00%
2006 43.40% 0.30%
2007 30.00% 0.00%
2008 2.20% 0.80%
2009 4.10% 0.40%
2010 22.00% 0.40%
2011 12.60% 1.20%
2012 75.20% 0.00%
2013 10.70% 0.30%
2014 23.10% 22.20%

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.