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 3.60% 5.60%
1911 27.20% 12.60%
1912 0.80% 53.80%
1913 1.30% 32.10%
1914 4.90% 3.60%
1915 1.40% 9.50%
1916 1.60% 28.00%
1917 0.20% 73.80%
1918 2.80% 15.60%
1919 5.50% 7.40%
1920 0.40% 15.10%
1921 44.50% 1.00%
1922 6.40% 16.80%
1923 0.60% 14.70%
1924 0.00% 53.80%
1925 12.80% 0.40%
1926 5.90% 7.70%
1927 13.90% 1.90%
1928 1.20% 1.30%
1929 0.50% 37.90%
1930 0.60% 3.70%
1931 25.00% 2.80%
1932 4.90% 5.90%
1933 13.30% 12.20%
1934 29.90% 3.70%
1935 5.10% 2.00%
1936 3.20% 10.30%
1937 0.60% 11.70%
1938 29.00% 0.20%
1939 1.90% 1.50%
1940 19.80% 34.20%
1941 17.10% 1.10%
1942 0.10% 15.70%
1943 0.80% 4.50%
1944 0.50% 11.00%
1945 1.20% 0.90%
1946 5.40% 3.10%
1947 0.70% 1.50%
1948 0.00% 13.50%
1949 16.80% 29.30%
1950 3.20% 28.90%
1951 0.00% 17.50%
1952 0.30% 2.60%
1953 4.00% 2.00%
1954 13.40% 1.50%
1955 1.10% 22.50%
1956 0.20% 1.90%
1957 4.80% 0.80%
1958 11.90% 8.30%
1959 1.40% 0.90%
1960 0.00% 8.00%
1961 3.60% 11.70%
1962 0.20% 2.80%
1963 4.20% 16.90%
1964 0.00% 20.50%
1965 0.00% 14.70%
1966 0.00% 26.80%
1967 2.10% 10.20%
1968 0.00% 16.50%
1969 0.40% 5.50%
1970 0.30% 5.50%
1971 0.00% 4.50%
1972 0.60% 4.20%
1973 18.90% 6.90%
1974 0.30% 1.20%
1975 0.90% 16.30%
1976 0.00% 17.20%
1977 1.50% 2.30%
1978 6.10% 35.30%
1979 0.90% 34.80%
1980 0.00% 0.00%
1981 17.20% 5.10%
1982 0.20% 13.60%
1983 25.30% 2.80%
1984 3.30% 3.60%
1985 0.20% 5.20%
1986 34.70% 0.00%
1987 18.00% 2.10%
1988 1.60% 17.70%
1989 1.30% 1.60%
1990 26.50% 0.20%
1991 30.00% 0.40%
1992 24.00% 0.30%
1993 1.50% 5.80%
1994 9.60% 1.90%
1995 5.30% 0.20%
1996 7.10% 5.50%
1997 9.50% 0.90%
1998 73.90% 0.00%
1999 11.40% 0.40%
2000 47.90% 0.00%
2001 13.10% 0.20%
2002 21.90% 0.70%
2003 32.70% 0.10%
2004 21.50% 0.00%
2005 37.90% 0.00%
2006 42.20% 0.30%
2007 32.10% 0.00%
2008 1.20% 3.00%
2009 4.60% 0.90%
2010 26.40% 0.40%
2011 11.70% 1.50%
2012 75.70% 0.00%
2013 10.60% 0.30%
2014 25.40% 12.80%

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.