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% 3.90%
1911 18.90% 5.90%
1912 0.90% 51.30%
1913 2.10% 28.00%
1914 5.30% 4.00%
1915 0.80% 4.60%
1916 2.00% 18.40%
1917 0.20% 63.90%
1918 2.20% 15.60%
1919 3.50% 6.10%
1920 0.40% 22.10%
1921 44.30% 1.00%
1922 9.60% 24.60%
1923 1.10% 11.80%
1924 0.00% 43.50%
1925 17.40% 0.00%
1926 11.20% 15.80%
1927 18.80% 0.80%
1928 1.00% 1.20%
1929 1.30% 41.20%
1930 0.60% 3.20%
1931 15.00% 5.00%
1932 9.60% 3.20%
1933 7.40% 20.60%
1934 35.20% 3.50%
1935 4.90% 0.80%
1936 2.90% 21.00%
1937 2.10% 27.40%
1938 24.10% 0.20%
1939 1.60% 1.90%
1940 15.60% 34.00%
1941 11.90% 2.30%
1942 0.10% 14.70%
1943 0.80% 5.00%
1944 0.60% 10.90%
1945 1.80% 2.00%
1946 10.40% 0.70%
1947 0.00% 21.10%
1948 0.30% 12.40%
1949 19.70% 25.80%
1950 6.10% 28.40%
1951 0.10% 12.30%
1952 5.80% 3.70%
1953 19.70% 1.00%
1954 5.50% 1.20%
1955 1.20% 29.00%
1956 0.00% 1.40%
1957 14.70% 0.50%
1958 9.30% 8.30%
1959 0.90% 0.50%
1960 0.60% 22.20%
1961 7.80% 4.10%
1962 0.00% 3.50%
1963 0.00% 13.80%
1964 0.10% 19.20%
1965 0.00% 9.10%
1966 0.00% 6.10%
1967 0.70% 1.80%
1968 0.70% 13.50%
1969 0.00% 5.90%
1970 0.40% 8.00%
1971 0.00% 18.20%
1972 0.60% 3.60%
1973 6.80% 7.30%
1974 3.30% 0.80%
1975 0.30% 9.70%
1976 0.30% 1.70%
1977 2.60% 3.80%
1978 11.00% 40.90%
1979 0.70% 40.20%
1980 0.70% 0.40%
1981 22.30% 1.70%
1982 0.20% 14.20%
1983 14.20% 6.80%
1984 3.50% 7.40%
1985 0.00% 2.80%
1986 43.60% 0.00%
1987 31.10% 2.10%
1988 0.30% 18.00%
1989 1.90% 0.80%
1990 31.40% 0.00%
1991 43.30% 0.40%
1992 36.10% 0.00%
1993 3.30% 2.50%
1994 8.60% 1.10%
1995 6.70% 0.00%
1996 12.00% 4.40%
1997 5.80% 0.10%
1998 58.20% 0.00%
1999 35.00% 0.90%
2000 45.70% 0.00%
2001 10.80% 0.00%
2002 14.40% 0.60%
2003 24.20% 0.40%
2004 14.20% 0.00%
2005 22.90% 0.00%
2006 60.60% 0.00%
2007 9.90% 0.20%
2008 0.50% 3.30%
2009 5.70% 0.30%
2010 17.70% 0.60%
2011 5.70% 0.80%
2012 73.60% 0.00%
2013 7.00% 0.80%
2014 16.30% 25.90%

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.