U.S. Climate Extremes Index (CEI): Graph

NCDC added Alaska climate divisions to its nClimDiv dataset on Friday, March 6, 2015, coincident with the release of the February 2015 monthly monitoring report. For more information on this data, please visit the Alaska Climate Divisions FAQ.

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: xml csv json
Year Wet Dry
1910 0.00% 44.10%
1911 0.00% 0.00%
1912 38.30% 0.00%
1913 0.00% 0.00%
1914 0.00% 20.10%
1915 25.20% 0.00%
1916 0.00% 12.40%
1917 11.00% 0.00%
1918 0.00% 0.00%
1919 0.00% 0.00%
1920 0.00% 0.00%
1921 0.00% 0.00%
1922 9.00% 0.00%
1923 0.00% 9.00%
1924 0.00% 29.20%
1925 10.00% 0.00%
1926 0.00% 29.40%
1927 0.00% 17.70%
1928 0.00% 0.00%
1929 0.00% 9.40%
1930 9.90% 0.00%
1931 0.00% 26.60%
1932 0.00% 0.00%
1933 0.00% 0.00%
1934 0.00% 54.80%
1935 0.00% 0.00%
1936 0.00% 19.50%
1937 0.00% 0.00%
1938 9.00% 0.00%
1939 0.00% 8.60%
1940 0.00% 0.00%
1941 18.60% 0.00%
1942 0.00% 0.00%
1943 0.00% 0.00%
1944 0.00% 0.00%
1945 9.00% 0.00%
1946 0.00% 0.00%
1947 0.00% 0.00%
1948 54.70% 0.00%
1949 0.00% 0.00%
1950 0.00% 9.40%
1951 0.00% 8.60%
1952 0.00% 0.00%
1953 9.00% 0.00%
1954 0.00% 8.60%
1955 0.00% 0.00%
1956 0.00% 0.00%
1957 40.10% 0.00%
1958 19.00% 0.00%
1959 0.00% 63.70%
1960 8.60% 9.00%
1961 0.00% 0.00%
1962 0.00% 0.00%
1963 63.30% 0.00%
1964 0.00% 0.00%
1965 0.00% 0.00%
1966 0.00% 18.50%
1967 73.30% 0.00%
1968 0.00% 9.00%
1969 0.00% 9.00%
1970 0.00% 27.50%
1971 9.00% 0.00%
1972 0.00% 46.30%
1973 0.00% 0.00%
1974 0.00% 9.00%
1975 28.00% 0.00%
1976 0.00% 27.20%
1977 10.00% 0.00%
1978 11.10% 0.00%
1979 0.00% 0.00%
1980 18.60% 0.00%
1981 9.10% 0.00%
1982 19.00% 0.00%
1983 91.00% 0.00%
1984 0.00% 0.00%
1985 0.00% 0.00%
1986 0.00% 0.00%
1987 9.10% 0.00%
1988 0.00% 0.00%
1989 9.00% 0.00%
1990 0.00% 0.00%
1991 19.80% 0.00%
1992 0.00% 9.00%
1993 8.60% 0.00%
1994 10.00% 0.00%
1995 81.40% 0.00%
1996 0.00% 0.00%
1997 0.00% 60.80%
1998 90.10% 0.00%
1999 0.00% 0.00%
2000 0.00% 0.00%
2001 0.00% 18.40%
2002 0.00% 0.00%
2003 9.80% 0.00%
2004 0.00% 66.80%
2005 11.00% 0.00%
2006 75.40% 0.00%
2007 0.00% 36.30%
2008 0.00% 60.20%
2009 0.00% 0.00%
2010 33.00% 0.00%
2011 80.00% 0.00%
2012 11.80% 0.00%
2013 0.00% 11.80%
2014 0.00% 0.00%
2015 0.00% 19.90%

*As of September 2005, the fourth and fifth indicators are computed with data from one station per each grid box rather than multiple stations. This was done to eliminate many of the artificial extremes which resulted from a changing number of available stations over time. Therefore, the percentages in the step 4 and 5 graphs above will likely be significantly different from the percentages calculated prior to the changes implemented in September 2005.

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.