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 1.10% 2.30%
1911 23.70% 3.60%
1912 0.80% 54.30%
1913 4.80% 39.20%
1914 4.60% 3.50%
1915 1.10% 3.10%
1916 7.10% 11.90%
1917 0.30% 40.20%
1918 0.80% 19.10%
1919 0.40% 7.50%
1920 3.20% 7.70%
1921 46.70% 0.00%
1922 3.20% 29.70%
1923 0.00% 9.40%
1924 0.00% 13.00%
1925 5.90% 1.00%
1926 6.30% 0.10%
1927 19.20% 0.20%
1928 1.20% 0.00%
1929 0.80% 37.70%
1930 0.70% 8.40%
1931 15.20% 1.00%
1932 17.40% 4.20%
1933 4.70% 18.80%
1934 28.20% 8.90%
1935 17.90% 0.30%
1936 0.60% 35.80%
1937 3.70% 48.90%
1938 34.30% 0.20%
1939 0.80% 4.00%
1940 11.90% 32.10%
1941 13.00% 6.30%
1942 1.20% 11.50%
1943 0.40% 4.40%
1944 0.60% 3.60%
1945 8.70% 0.00%
1946 19.00% 3.90%
1947 0.00% 10.60%
1948 0.30% 19.10%
1949 18.90% 38.40%
1950 14.10% 17.10%
1951 0.60% 3.10%
1952 7.10% 7.90%
1953 30.90% 0.00%
1954 1.30% 0.20%
1955 0.00% 21.50%
1956 0.20% 0.40%
1957 13.90% 3.80%
1958 5.70% 17.40%
1959 0.30% 3.60%
1960 0.10% 23.70%
1961 9.30% 0.10%
1962 0.00% 4.00%
1963 0.00% 27.50%
1964 0.10% 23.20%
1965 0.00% 16.00%
1966 0.10% 5.70%
1967 2.70% 0.00%
1968 1.10% 15.70%
1969 0.10% 10.50%
1970 2.00% 19.70%
1971 0.20% 2.20%
1972 0.70% 2.10%
1973 13.20% 2.40%
1974 15.70% 0.60%
1975 0.50% 0.70%
1976 1.40% 1.70%
1977 0.00% 20.50%
1978 23.30% 50.00%
1979 0.10% 40.50%
1980 8.30% 0.20%
1981 14.20% 8.20%
1982 0.20% 9.40%
1983 47.90% 0.00%
1984 6.60% 4.30%
1985 0.00% 10.00%
1986 38.50% 0.00%
1987 20.90% 0.60%
1988 0.20% 4.80%
1989 2.30% 1.80%
1990 50.70% 0.20%
1991 5.10% 0.00%
1992 48.50% 0.20%
1993 6.70% 2.90%
1994 0.70% 7.40%
1995 27.40% 0.00%
1996 5.10% 5.20%
1997 5.90% 0.00%
1998 51.60% 0.00%
1999 26.80% 0.00%
2000 49.10% 0.00%
2001 0.80% 0.00%
2002 11.80% 2.00%
2003 21.40% 0.60%
2004 7.50% 0.10%
2005 29.90% 0.00%
2006 34.00% 0.50%
2007 2.50% 0.70%
2008 0.30% 0.60%
2009 3.40% 0.00%
2010 16.20% 8.30%
2011 0.10% 3.00%
2012 64.80% 0.00%
2013 1.20% 2.60%
2014 8.80% 35.50%

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.