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
1911 15.80% 3.40%
1912 0.20% 33.60%
1913 3.80% 24.60%
1914 2.80% 2.10%
1915 0.40% 2.40%
1916 3.70% 9.10%
1917 0.20% 45.30%
1918 5.10% 53.30%
1919 12.10% 8.90%
1920 5.10% 19.20%
1921 23.50% 1.90%
1922 5.70% 14.50%
1923 12.00% 4.50%
1924 0.20% 2.00%
1925 0.80% 6.90%
1926 14.70% 0.00%
1927 18.30% 0.00%
1928 0.00% 1.10%
1929 0.00% 47.70%
1930 1.80% 1.90%
1931 26.40% 1.80%
1932 44.50% 9.90%
1933 8.60% 32.80%
1934 28.20% 5.30%
1935 5.70% 1.70%
1936 0.20% 53.60%
1937 13.90% 39.90%
1938 15.80% 0.00%
1939 0.00% 1.40%
1940 15.90% 16.30%
1941 23.90% 0.20%
1942 2.70% 2.10%
1943 1.90% 0.30%
1944 0.50% 0.60%
1945 0.90% 1.70%
1946 0.20% 5.20%
1947 0.50% 0.20%
1948 0.20% 8.10%
1949 22.30% 39.80%
1950 25.30% 16.30%
1951 4.30% 2.60%
1952 17.80% 2.20%
1953 28.20% 0.20%
1954 7.40% 0.40%
1955 0.00% 12.50%
1956 1.60% 2.90%
1957 27.10% 2.40%
1958 17.80% 8.20%
1959 5.60% 15.90%
1960 2.50% 1.20%
1961 4.10% 6.70%
1962 0.00% 3.20%
1963 0.50% 39.90%
1964 0.30% 37.60%
1965 1.50% 5.00%
1966 0.00% 2.70%
1967 7.60% 2.10%
1968 0.30% 2.50%
1969 0.30% 8.40%
1970 10.20% 17.30%
1971 0.80% 1.00%
1972 8.00% 2.50%
1973 0.00% 5.80%
1974 5.40% 2.10%
1975 2.50% 1.80%
1976 5.90% 0.70%
1977 0.30% 47.40%
1978 24.20% 50.40%
1979 0.00% 63.50%
1980 12.70% 0.00%
1981 24.00% 6.40%
1982 0.70% 10.90%
1983 44.50% 0.00%
1984 1.00% 18.60%
1985 0.20% 11.20%
1986 11.40% 0.60%
1987 25.20% 0.60%
1988 0.00% 1.30%
1989 0.20% 7.20%
1990 1.30% 3.50%
1991 4.60% 2.80%
1992 49.40% 0.40%
1993 3.30% 9.60%
1994 1.40% 7.00%
1995 35.10% 0.00%
1996 13.30% 0.50%
1997 8.90% 0.00%
1998 54.20% 0.00%
1999 40.00% 0.30%
2000 37.30% 0.00%
2001 0.40% 3.40%
2002 28.10% 0.80%
2003 23.40% 0.50%
2004 1.10% 0.30%
2005 32.40% 0.00%
2006 20.70% 0.40%
2007 1.50% 1.50%
2008 1.30% 0.70%
2009 2.30% 0.30%
2010 2.50% 6.60%
2011 0.50% 7.90%
2012 38.50% 0.50%
2013 15.90% 1.70%
2014 7.60% 21.30%

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.