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 9.30% 0.50%
1911 29.90% 5.50%
1912 0.00% 55.40%
1913 4.20% 16.10%
1914 2.40% 3.20%
1915 0.80% 25.80%
1916 4.50% 20.60%
1917 0.20% 52.20%
1918 3.50% 0.30%
1919 3.20% 11.10%
1920 0.50% 24.40%
1921 42.20% 0.40%
1922 1.00% 21.70%
1923 0.00% 7.10%
1924 7.10% 33.20%
1925 32.20% 0.40%
1926 18.30% 12.50%
1927 9.40% 0.80%
1928 1.80% 2.50%
1929 0.30% 30.30%
1930 2.50% 0.40%
1931 22.70% 2.90%
1932 8.60% 5.20%
1933 20.60% 16.70%
1934 57.90% 0.30%
1935 1.00% 1.70%
1936 1.90% 11.50%
1937 1.10% 31.00%
1938 10.30% 1.20%
1939 6.00% 0.10%
1940 13.70% 38.40%
1941 5.50% 11.50%
1942 0.00% 8.90%
1943 4.90% 3.10%
1944 4.30% 12.20%
1945 5.70% 1.60%
1946 24.80% 0.20%
1947 2.00% 14.10%
1948 0.20% 5.00%
1949 11.90% 19.90%
1950 8.80% 20.40%
1951 0.00% 7.60%
1952 11.50% 6.20%
1953 24.10% 0.60%
1954 20.30% 0.90%
1955 0.50% 19.20%
1956 0.80% 0.70%
1957 0.40% 7.20%
1958 5.80% 36.30%
1959 3.10% 0.00%
1960 0.00% 30.00%
1961 8.10% 3.30%
1962 0.00% 0.60%
1963 0.90% 1.00%
1964 2.00% 10.40%
1965 0.00% 9.80%
1966 0.60% 11.80%
1967 5.40% 4.00%
1968 0.30% 7.20%
1969 0.00% 11.70%
1970 0.20% 5.20%
1971 0.70% 4.10%
1972 13.00% 1.10%
1973 0.60% 17.80%
1974 8.80% 0.40%
1975 0.80% 24.60%
1976 9.20% 0.00%
1977 4.70% 0.40%
1978 0.00% 47.30%
1979 0.00% 56.90%
1980 0.20% 9.30%
1981 24.80% 0.20%
1982 0.00% 16.50%
1983 1.70% 27.90%
1984 2.30% 7.00%
1985 0.20% 1.30%
1986 36.50% 0.00%
1987 40.00% 2.10%
1988 11.50% 0.50%
1989 6.70% 0.20%
1990 25.80% 0.00%
1991 18.90% 0.40%
1992 28.80% 0.40%
1993 0.00% 22.40%
1994 16.70% 0.30%
1995 1.10% 0.40%
1996 14.00% 3.80%
1997 4.50% 2.00%
1998 16.90% 7.40%
1999 11.50% 0.50%
2000 59.20% 0.00%
2001 3.10% 0.00%
2002 21.00% 0.00%
2003 6.30% 5.70%
2004 9.90% 0.00%
2005 3.30% 1.20%
2006 61.50% 0.30%
2007 18.90% 1.80%
2008 5.00% 1.60%
2009 7.70% 0.20%
2010 9.40% 2.50%
2011 12.80% 8.00%
2012 83.20% 0.10%
2013 6.50% 1.80%
2014 19.20% 13.10%

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.