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 59.50% 0.00%
1911 12.20% 2.20%
1912 0.10% 34.60%
1913 0.50% 3.40%
1914 4.30% 2.20%
1915 2.00% 28.60%
1916 2.20% 7.40%
1917 0.00% 53.90%
1918 17.10% 0.70%
1919 0.80% 4.90%
1920 0.00% 31.60%
1921 28.80% 1.30%
1922 1.00% 18.10%
1923 0.00% 10.90%
1924 4.30% 50.80%
1925 32.40% 0.40%
1926 16.20% 30.70%
1927 4.90% 5.00%
1928 1.70% 4.70%
1929 2.00% 3.60%
1930 1.20% 0.90%
1931 9.60% 31.10%
1932 0.00% 5.60%
1933 1.90% 9.60%
1934 53.10% 0.10%
1935 2.60% 12.20%
1936 16.70% 0.10%
1937 0.00% 2.60%
1938 11.50% 1.70%
1939 14.00% 1.10%
1940 11.80% 17.50%
1941 5.80% 13.10%
1942 5.50% 2.90%
1943 1.80% 5.60%
1944 0.20% 12.20%
1945 17.30% 3.20%
1946 27.00% 0.20%
1947 9.80% 31.20%
1948 4.80% 12.20%
1949 3.00% 0.30%
1950 0.40% 25.70%
1951 0.00% 8.90%
1952 0.00% 3.20%
1953 1.30% 2.60%
1954 0.60% 3.10%
1955 24.10% 13.40%
1956 3.70% 6.30%
1957 0.00% 16.70%
1958 1.30% 30.80%
1959 1.70% 0.00%
1960 0.20% 34.00%
1961 0.20% 11.40%
1962 0.00% 1.20%
1963 18.60% 4.00%
1964 0.20% 10.30%
1965 0.00% 19.30%
1966 7.20% 1.10%
1967 18.00% 17.70%
1968 0.30% 2.80%
1969 0.20% 8.90%
1970 0.00% 9.80%
1971 0.20% 9.80%
1972 18.60% 0.90%
1973 0.10% 12.80%
1974 15.20% 2.80%
1975 0.70% 39.30%
1976 2.20% 0.40%
1977 42.70% 1.00%
1978 0.60% 6.00%
1979 0.00% 6.90%
1980 3.80% 9.90%
1981 9.50% 0.20%
1982 0.00% 1.60%
1983 1.10% 49.80%
1984 2.50% 28.90%
1985 29.70% 0.30%
1986 19.50% 0.00%
1987 41.90% 2.40%
1988 13.30% 0.00%
1989 17.90% 0.60%
1990 0.50% 0.00%
1991 19.10% 8.70%
1992 30.00% 1.10%
1993 1.20% 20.70%
1994 18.30% 0.00%
1995 2.80% 13.00%
1996 8.80% 15.10%
1997 9.20% 3.60%
1998 9.20% 7.90%
1999 2.70% 1.60%
2000 41.10% 0.00%
2001 7.10% 0.00%
2002 10.60% 7.50%
2003 1.60% 0.00%
2004 40.90% 0.00%
2005 1.10% 0.90%
2006 31.90% 0.70%
2007 36.80% 0.00%
2008 1.40% 1.80%
2009 1.60% 0.60%
2010 21.00% 3.80%
2011 16.30% 13.90%
2012 79.30% 0.00%
2013 8.40% 24.70%
2014 7.90% 5.60%

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.