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 1.90% 0.00%
1911 8.70% 0.00%
1912 0.00% 21.90%
1913 0.00% 24.20%
1914 0.00% 8.70%
1915 0.00% 28.80%
1916 0.00% 0.00%
1917 0.00% 65.20%
1918 4.80% 0.00%
1919 0.00% 1.90%
1920 0.00% 26.60%
1921 7.50% 0.00%
1922 6.70% 0.00%
1923 0.00% 19.10%
1924 0.00% 85.30%
1925 29.40% 0.00%
1926 0.00% 36.20%
1927 45.10% 0.00%
1928 0.00% 2.90%
1929 22.20% 0.00%
1930 0.00% 0.00%
1931 0.00% 88.00%
1932 0.00% 6.90%
1933 3.90% 4.80%
1934 6.50% 3.00%
1935 19.50% 0.00%
1936 2.90% 0.00%
1937 0.00% 6.90%
1938 41.40% 0.00%
1939 0.00% 0.00%
1940 0.00% 4.70%
1941 3.50% 1.00%
1942 0.00% 5.80%
1943 0.00% 9.00%
1944 0.00% 9.50%
1945 5.70% 5.60%
1946 38.10% 0.00%
1947 0.00% 46.00%
1948 3.90% 0.90%
1949 0.00% 0.00%
1950 0.00% 17.10%
1951 0.00% 23.60%
1952 0.00% 30.70%
1953 9.80% 0.90%
1954 1.90% 0.90%
1955 33.50% 0.00%
1956 0.00% 0.00%
1957 0.00% 0.00%
1958 0.00% 8.50%
1959 0.00% 1.00%
1960 0.00% 51.80%
1961 0.00% 0.00%
1962 0.00% 2.00%
1963 52.70% 0.00%
1964 0.00% 0.00%
1965 0.00% 0.90%
1966 0.00% 0.90%
1967 34.90% 0.00%
1968 0.00% 1.80%
1969 0.00% 16.60%
1970 0.00% 10.70%
1971 0.00% 37.20%
1972 1.00% 0.00%
1973 0.00% 4.90%
1974 65.40% 0.00%
1975 0.00% 11.50%
1976 0.00% 0.00%
1977 37.40% 0.00%
1978 1.00% 0.90%
1979 0.00% 0.00%
1980 0.00% 32.00%
1981 16.40% 0.00%
1982 1.90% 0.00%
1983 0.00% 61.80%
1984 0.00% 11.90%
1985 70.40% 0.00%
1986 38.90% 0.00%
1987 6.20% 16.70%
1988 0.00% 21.30%
1989 6.70% 0.00%
1990 2.00% 0.00%
1991 74.20% 0.00%
1992 6.50% 0.00%
1993 0.00% 16.40%
1994 1.80% 0.00%
1995 4.90% 0.00%
1996 1.00% 6.30%
1997 0.00% 14.80%
1998 0.90% 0.00%
1999 3.00% 0.00%
2000 35.60% 0.00%
2001 14.80% 0.00%
2002 3.90% 2.70%
2003 7.50% 0.00%
2004 73.30% 0.00%
2005 0.00% 0.00%
2006 78.70% 0.00%
2007 44.20% 0.00%
2008 0.00% 1.80%
2009 1.00% 0.00%
2010 6.40% 1.00%
2011 9.80% 1.90%
2012 97.10% 0.00%
2013 0.00% 39.70%
2014 0.00% 28.30%

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.