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 68.40% 0.00%
1911 2.00% 0.00%
1912 0.00% 57.90%
1913 1.10% 12.00%
1914 5.20% 0.00%
1915 23.50% 1.10%
1916 0.00% 1.10%
1917 0.00% 83.00%
1918 1.00% 2.10%
1919 0.00% 1.00%
1920 0.00% 31.00%
1921 7.60% 0.00%
1922 3.90% 9.30%
1923 0.00% 37.80%
1924 0.00% 44.70%
1925 27.00% 0.00%
1926 7.30% 0.00%
1927 0.00% 2.10%
1928 2.00% 1.10%
1929 0.00% 3.10%
1930 3.10% 0.00%
1931 0.00% 5.30%
1932 0.00% 2.10%
1933 0.00% 6.40%
1934 47.30% 0.00%
1935 1.10% 26.00%
1936 0.00% 0.00%
1937 0.00% 0.00%
1938 12.80% 0.00%
1939 5.20% 0.00%
1940 27.50% 1.00%
1941 24.90% 0.00%
1942 0.00% 5.40%
1943 0.00% 41.90%
1944 0.00% 0.00%
1945 0.00% 3.10%
1946 43.70% 0.00%
1947 2.10% 17.80%
1948 0.00% 6.10%
1949 5.30% 0.00%
1950 0.00% 69.30%
1951 0.00% 76.00%
1952 0.00% 3.20%
1953 0.00% 3.20%
1954 0.00% 36.00%
1955 0.00% 31.50%
1956 0.00% 7.00%
1957 1.00% 0.00%
1958 2.00% 0.00%
1959 0.00% 0.00%
1960 0.00% 23.10%
1961 3.00% 0.00%
1962 0.00% 0.00%
1963 5.20% 0.00%
1964 0.00% 12.80%
1965 0.00% 67.40%
1966 0.00% 0.00%
1967 0.00% 12.70%
1968 0.00% 3.30%
1969 0.00% 4.20%
1970 0.00% 15.70%
1971 0.00% 0.00%
1972 2.10% 0.00%
1973 4.00% 6.40%
1974 2.20% 0.00%
1975 0.00% 30.60%
1976 0.00% 3.20%
1977 48.90% 0.00%
1978 7.40% 0.00%
1979 0.00% 6.90%
1980 1.00% 0.00%
1981 37.90% 0.00%
1982 0.00% 4.10%
1983 0.00% 1.10%
1984 0.00% 1.10%
1985 41.10% 0.00%
1986 71.80% 0.00%
1987 81.90% 0.00%
1988 10.70% 0.00%
1989 6.40% 0.00%
1990 2.10% 0.00%
1991 44.60% 0.00%
1992 47.70% 0.00%
1993 20.90% 0.00%
1994 31.30% 0.00%
1995 0.00% 3.10%
1996 0.00% 30.90%
1997 0.00% 10.40%
1998 5.90% 1.00%
1999 12.10% 1.00%
2000 21.50% 0.00%
2001 13.80% 0.00%
2002 0.00% 70.40%
2003 11.60% 0.00%
2004 35.90% 0.00%
2005 1.10% 0.00%
2006 14.20% 0.00%
2007 71.60% 0.00%
2008 0.00% 15.90%
2009 0.00% 0.90%
2010 31.40% 3.20%
2011 1.10% 1.00%
2012 75.60% 0.00%
2013 0.00% 29.80%
2014 1.10% 2.00%

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.