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% 1.70%
1911 0.00% 0.00%
1912 10.30% 0.00%
1913 0.90% 0.00%
1914 0.00% 57.20%
1915 4.70% 0.00%
1916 14.60% 0.00%
1917 2.70% 3.30%
1918 0.90% 15.60%
1919 0.90% 0.00%
1920 11.50% 0.00%
1921 0.00% 2.10%
1922 0.00% 1.00%
1923 0.00% 5.40%
1924 0.00% 0.00%
1925 0.00% 15.30%
1926 1.50% 0.00%
1927 75.30% 0.00%
1928 29.50% 0.00%
1929 32.50% 0.00%
1930 0.00% 38.90%
1931 0.00% 67.80%
1932 0.00% 4.10%
1933 0.00% 1.20%
1934 0.00% 50.10%
1935 5.00% 11.40%
1936 0.00% 18.40%
1937 6.20% 0.00%
1938 0.00% 4.70%
1939 0.00% 0.00%
1940 0.00% 59.30%
1941 0.00% 54.10%
1942 6.70% 11.00%
1943 2.40% 9.20%
1944 0.00% 27.30%
1945 14.80% 0.00%
1946 3.20% 2.40%
1947 0.00% 6.50%
1948 0.00% 0.00%
1949 6.00% 0.00%
1950 69.30% 0.00%
1951 41.60% 0.00%
1952 0.00% 0.00%
1953 0.00% 71.40%
1954 0.00% 79.90%
1955 0.00% 25.90%
1956 1.40% 28.70%
1957 1.30% 7.10%
1958 13.90% 0.00%
1959 4.90% 3.20%
1960 0.00% 2.10%
1961 4.70% 1.60%
1962 0.00% 1.60%
1963 0.00% 37.60%
1964 0.00% 52.30%
1965 0.00% 11.70%
1966 0.00% 6.90%
1967 0.00% 1.80%
1968 0.00% 3.80%
1969 0.00% 3.20%
1970 8.70% 0.90%
1971 0.00% 0.00%
1972 8.60% 0.00%
1973 73.20% 0.00%
1974 59.50% 0.00%
1975 36.30% 0.00%
1976 0.00% 0.00%
1977 0.00% 0.00%
1978 1.00% 0.00%
1979 44.40% 0.00%
1980 5.30% 15.50%
1981 6.40% 0.00%
1982 22.70% 0.00%
1983 3.60% 0.00%
1984 0.00% 0.00%
1985 24.10% 0.00%
1986 5.10% 3.50%
1987 0.00% 12.60%
1988 0.00% 32.90%
1989 36.20% 8.50%
1990 29.90% 0.00%
1991 0.00% 4.80%
1992 0.00% 0.00%
1993 42.10% 0.00%
1994 29.20% 0.00%
1995 0.00% 0.00%
1996 19.10% 0.00%
1997 30.30% 0.00%
1998 1.30% 0.00%
1999 0.00% 26.00%
2000 0.00% 27.20%
2001 0.00% 0.00%
2002 8.40% 0.00%
2003 31.30% 4.70%
2004 47.90% 0.00%
2005 0.00% 6.40%
2006 2.80% 11.20%
2007 5.20% 14.70%
2008 43.20% 9.90%
2009 43.10% 0.00%
2010 25.60% 0.00%
2011 29.80% 0.00%
2012 1.10% 14.10%
2013 8.10% 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.