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 65.30% 0.00%
1911 1.30% 0.00%
1912 0.00% 75.90%
1913 1.40% 5.80%
1914 4.20% 0.00%
1915 0.00% 38.90%
1916 1.40% 0.00%
1917 0.00% 84.10%
1918 0.00% 2.90%
1919 1.30% 8.70%
1920 0.00% 51.30%
1921 0.00% 0.00%
1922 0.00% 38.90%
1923 0.00% 22.20%
1924 0.00% 29.70%
1925 31.00% 0.00%
1926 4.00% 19.10%
1927 5.80% 2.80%
1928 1.30% 0.00%
1929 0.00% 12.40%
1930 1.40% 0.00%
1931 1.40% 7.30%
1932 0.00% 4.20%
1933 0.00% 29.10%
1934 94.10% 0.00%
1935 0.00% 25.60%
1936 26.80% 0.00%
1937 0.00% 0.00%
1938 0.00% 2.80%
1939 2.60% 0.00%
1940 19.20% 0.00%
1941 0.00% 47.80%
1942 0.00% 9.50%
1943 11.40% 0.00%
1944 0.00% 35.10%
1945 0.00% 7.10%
1946 5.60% 0.00%
1947 2.80% 0.00%
1948 0.00% 4.20%
1949 0.00% 0.00%
1950 1.50% 1.30%
1951 0.00% 1.40%
1952 0.00% 13.00%
1953 0.00% 0.00%
1954 4.20% 0.00%
1955 0.00% 2.60%
1956 2.90% 0.00%
1957 0.00% 29.40%
1958 0.00% 19.90%
1959 0.00% 0.00%
1960 1.50% 0.00%
1961 0.00% 0.00%
1962 0.00% 0.00%
1963 1.40% 0.00%
1964 0.00% 28.80%
1965 0.00% 42.20%
1966 13.90% 0.00%
1967 1.50% 2.70%
1968 0.00% 1.40%
1969 0.00% 0.00%
1970 0.00% 7.00%
1971 0.00% 1.30%
1972 67.20% 0.00%
1973 0.00% 63.00%
1974 15.70% 0.00%
1975 0.00% 67.50%
1976 0.00% 1.50%
1977 0.00% 1.50%
1978 0.00% 0.00%
1979 0.00% 2.80%
1980 0.00% 26.80%
1981 0.00% 0.00%
1982 0.00% 0.00%
1983 0.00% 77.00%
1984 1.50% 4.00%
1985 4.00% 0.00%
1986 5.50% 0.00%
1987 8.00% 2.80%
1988 0.00% 0.00%
1989 86.60% 0.00%
1990 0.00% 0.00%
1991 0.00% 11.20%
1992 35.20% 0.00%
1993 1.50% 1.40%
1994 22.90% 0.00%
1995 0.00% 11.10%
1996 53.50% 0.00%
1997 17.60% 0.00%
1998 0.00% 8.70%
1999 0.00% 0.00%
2000 83.40% 0.00%
2001 11.20% 0.00%
2002 53.00% 0.00%
2003 1.50% 0.00%
2004 68.20% 0.00%
2005 0.00% 0.00%
2006 45.20% 0.00%
2007 54.30% 0.00%
2008 1.50% 0.00%
2009 7.10% 0.00%
2010 0.00% 0.00%
2011 21.80% 1.40%
2012 86.90% 0.00%
2013 23.30% 0.00%
2014 5.80% 0.00%

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.