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

NCEI 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% 45.80%
1911 6.80% 15.90%
1912 7.20% 15.20%
1913 5.50% 13.70%
1914 8.20% 16.90%
1915 13.00% 9.60%
1916 4.10% 17.50%
1917 2.10% 26.90%
1918 3.90% 12.60%
1919 6.20% 12.60%
1920 2.80% 11.10%
1921 1.30% 15.70%
1922 7.40% 15.50%
1923 9.00% 16.10%
1924 2.30% 28.90%
1925 2.40% 16.90%
1926 8.60% 9.30%
1927 10.20% 5.70%
1928 2.90% 16.20%
1929 9.80% 18.80%
1930 2.20% 21.70%
1931 3.60% 18.50%
1932 5.40% 9.90%
1933 0.70% 17.10%
1934 0.60% 27.50%
1935 5.50% 10.10%
1936 3.20% 20.00%
1937 8.50% 5.10%
1938 5.90% 7.10%
1939 2.30% 21.50%
1940 8.50% 3.00%
1941 33.10% 8.50%
1942 8.50% 2.90%
1943 1.00% 18.90%
1944 8.70% 6.90%
1945 20.50% 3.30%
1946 4.10% 6.30%
1947 8.50% 6.60%
1948 10.30% 6.60%
1949 13.00% 6.30%
1950 13.70% 10.00%
1951 16.80% 4.20%
1952 3.50% 17.30%
1953 5.70% 16.70%
1954 2.50% 23.20%
1955 2.80% 12.00%
1956 2.70% 21.50%
1957 34.70% 2.50%
1958 10.30% 6.70%
1959 9.80% 11.40%
1960 4.50% 4.60%
1961 8.90% 7.30%
1962 3.50% 7.10%
1963 2.60% 16.40%
1964 4.80% 8.50%
1965 13.90% 3.50%
1966 1.10% 14.20%
1967 4.80% 4.70%
1968 12.20% 2.70%
1969 8.00% 2.80%
1970 6.30% 7.50%
1971 9.30% 3.60%
1972 13.50% 3.00%
1973 21.00% 3.20%
1974 9.70% 4.90%
1975 18.20% 2.80%
1976 2.40% 23.50%
1977 10.00% 2.00%
1978 10.10% 5.00%
1979 7.00% 2.60%
1980 3.50% 9.40%
1981 6.90% 3.70%
1982 23.80% 0.50%
1983 33.90% 1.60%
1984 20.50% 2.50%
1985 13.20% 4.20%
1986 11.60% 1.40%
1987 6.90% 6.20%
1988 1.20% 13.40%
1989 9.90% 10.10%
1990 10.60% 9.10%
1991 14.60% 4.60%
1992 23.00% 2.90%
1993 26.10% 2.00%
1994 7.40% 5.10%
1995 14.50% 5.60%
1996 23.90% 4.20%
1997 12.90% 3.10%
1998 26.70% 3.80%
1999 4.40% 11.20%
2000 5.60% 5.80%
2001 3.20% 5.90%
2002 3.30% 11.90%
2003 13.30% 4.60%
2004 20.30% 1.90%
2005 7.90% 4.90%
2006 12.40% 9.30%
2007 11.70% 12.50%
2008 17.40% 5.10%
2009 22.30% 3.30%
2010 21.30% 9.90%
2011 21.70% 8.50%
2012 6.70% 16.60%
2013 17.90% 8.30%
2014 18.10% 3.50%

*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.