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 4.40% 2.50%
1911 18.50% 3.10%
1912 0.50% 56.50%
1913 5.00% 25.80%
1914 3.20% 4.50%
1915 0.80% 25.10%
1916 7.00% 11.60%
1917 1.10% 32.70%
1918 0.40% 2.00%
1919 2.70% 12.50%
1920 1.30% 4.30%
1921 51.10% 0.20%
1922 0.00% 28.90%
1923 0.50% 7.50%
1924 1.90% 20.50%
1925 17.10% 0.00%
1926 11.40% 3.00%
1927 7.30% 0.20%
1928 3.10% 0.00%
1929 0.30% 28.00%
1930 2.00% 2.70%
1931 18.50% 1.80%
1932 11.80% 7.70%
1933 4.00% 12.00%
1934 40.30% 3.60%
1935 16.50% 1.00%
1936 0.70% 25.90%
1937 0.30% 49.30%
1938 26.50% 3.50%
1939 10.00% 5.00%
1940 0.50% 40.10%
1941 9.10% 11.20%
1942 1.50% 6.40%
1943 2.40% 0.90%
1944 0.00% 3.70%
1945 7.30% 1.00%
1946 34.00% 0.20%
1947 3.10% 9.70%
1948 0.00% 15.00%
1949 16.10% 43.40%
1950 15.80% 15.10%
1951 0.30% 2.50%
1952 3.60% 18.40%
1953 37.10% 0.00%
1954 12.20% 0.00%
1955 0.00% 13.50%
1956 0.00% 3.10%
1957 1.40% 4.10%
1958 2.40% 39.60%
1959 0.50% 0.70%
1960 0.00% 43.70%
1961 8.00% 0.40%
1962 0.00% 11.60%
1963 1.00% 4.70%
1964 0.70% 8.20%
1965 0.00% 6.50%
1966 0.30% 7.10%
1967 12.80% 0.00%
1968 7.10% 8.60%
1969 0.00% 29.00%
1970 2.50% 17.20%
1971 1.50% 2.20%
1972 17.40% 1.70%
1973 7.20% 15.90%
1974 13.10% 0.90%
1975 0.80% 2.70%
1976 25.40% 0.20%
1977 0.30% 2.40%
1978 3.20% 56.00%
1979 0.00% 60.50%
1980 0.00% 8.50%
1981 30.30% 0.10%
1982 0.50% 9.90%
1983 10.90% 4.40%
1984 5.60% 3.20%
1985 0.00% 9.30%
1986 45.20% 0.00%
1987 16.60% 0.80%
1988 5.30% 0.90%
1989 2.00% 2.40%
1990 44.80% 0.00%
1991 3.30% 0.20%
1992 38.90% 0.40%
1993 0.00% 11.90%
1994 10.20% 7.50%
1995 10.30% 0.00%
1996 8.60% 1.70%
1997 7.70% 0.00%
1998 16.30% 0.50%
1999 32.40% 0.50%
2000 59.90% 0.00%
2001 0.40% 0.80%
2002 16.20% 0.20%
2003 15.80% 0.90%
2004 6.00% 0.00%
2005 9.20% 0.70%
2006 38.60% 0.30%
2007 6.60% 0.40%
2008 1.60% 0.40%
2009 19.60% 0.00%
2010 11.70% 20.60%
2011 2.40% 0.70%
2012 75.50% 0.00%
2013 3.40% 0.40%
2014 21.80% 19.20%

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.