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: Wet Data | Dry Data
Year Wet Dry
1910 0.00% 1.80%
1911 0.00% 8.00%
1912 55.60% 0.00%
1913 0.00% 0.00%
1914 0.00% 15.20%
1915 8.80% 0.00%
1916 0.00% 0.00%
1917 0.00% 0.00%
1918 1.80% 0.00%
1919 16.70% 0.00%
1920 21.50% 0.00%
1921 0.00% 1.00%
1922 7.80% 0.00%
1923 0.00% 1.80%
1924 2.40% 0.00%
1925 0.00% 42.00%
1926 13.70% 25.50%
1927 0.00% 50.60%
1928 38.40% 0.00%
1929 67.50% 0.00%
1930 13.30% 23.80%
1931 0.00% 42.10%
1932 1.30% 14.80%
1933 0.00% 4.30%
1934 0.00% 16.60%
1935 5.60% 0.00%
1936 14.90% 0.00%
1937 13.40% 0.00%
1938 2.60% 1.00%
1939 0.00% 0.90%
1940 0.00% 2.20%
1941 7.30% 27.20%
1942 0.00% 8.20%
1943 0.00% 7.90%
1944 0.00% 6.40%
1945 0.00% 0.90%
1946 27.00% 0.00%
1947 29.30% 0.00%
1948 44.00% 0.00%
1949 21.10% 0.00%
1950 1.60% 0.00%
1951 0.00% 14.30%
1952 0.00% 10.20%
1953 4.00% 0.00%
1954 4.90% 55.70%
1955 0.00% 49.50%
1956 0.00% 21.50%
1957 0.00% 0.00%
1958 23.10% 0.00%
1959 28.30% 0.00%
1960 26.20% 0.00%
1961 12.90% 0.00%
1962 9.90% 0.90%
1963 0.00% 5.30%
1964 44.30% 4.40%
1965 31.90% 6.20%
1966 9.70% 9.50%
1967 0.00% 0.00%
1968 0.00% 4.10%
1969 4.60% 0.00%
1970 0.00% 0.00%
1971 24.60% 8.60%
1972 21.00% 0.00%
1973 33.90% 0.00%
1974 15.00% 0.00%
1975 61.40% 8.60%
1976 32.60% 0.00%
1977 0.00% 0.00%
1978 8.30% 0.00%
1979 44.80% 0.00%
1980 0.00% 0.00%
1981 0.00% 30.20%
1982 2.70% 0.00%
1983 22.00% 0.00%
1984 8.20% 0.00%
1985 0.00% 6.40%
1986 0.00% 34.20%
1987 0.00% 1.30%
1988 0.00% 14.80%
1989 28.10% 4.60%
1990 5.90% 13.10%
1991 12.70% 5.20%
1992 4.80% 0.00%
1993 0.00% 0.00%
1994 5.60% 0.00%
1995 16.20% 0.00%
1996 23.60% 0.00%
1997 6.40% 0.00%
1998 0.00% 0.00%
1999 0.00% 38.60%
2000 0.00% 56.60%
2001 1.60% 27.60%
2002 0.00% 31.10%
2003 44.30% 0.00%
2004 13.90% 0.00%
2005 2.90% 0.00%
2006 0.00% 21.10%
2007 0.00% 82.50%
2008 0.00% 36.60%
2009 4.30% 2.40%
2010 0.00% 0.00%
2011 0.00% 61.50%
2012 0.00% 31.10%
2013 40.20% 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.