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 17.30% 3.40%
1911 5.40% 15.90%
1912 2.80% 16.30%
1913 0.00% 22.90%
1914 0.00% 20.80%
1915 2.20% 9.50%
1916 18.00% 2.40%
1917 7.10% 7.20%
1918 0.00% 22.30%
1919 13.00% 0.00%
1920 11.60% 7.20%
1921 2.40% 17.00%
1922 12.70% 5.10%
1923 10.40% 12.50%
1924 7.50% 10.00%
1925 0.00% 40.00%
1926 12.10% 4.70%
1927 9.90% 0.00%
1928 28.20% 0.00%
1929 2.40% 7.50%
1930 0.00% 36.90%
1931 2.20% 17.50%
1932 14.40% 6.80%
1933 2.30% 4.50%
1934 6.90% 2.20%
1935 4.80% 0.00%
1936 0.00% 11.80%
1937 16.30% 2.50%
1938 2.20% 2.30%
1939 24.90% 0.00%
1940 7.00% 4.60%
1941 23.60% 0.00%
1942 6.50% 0.00%
1943 2.40% 18.50%
1944 2.40% 8.90%
1945 6.70% 2.10%
1946 2.50% 5.00%
1947 4.60% 2.30%
1948 4.70% 7.20%
1949 29.40% 0.00%
1950 17.50% 0.00%
1951 0.00% 13.90%
1952 4.40% 13.50%
1953 2.30% 20.10%
1954 0.00% 50.70%
1955 2.20% 4.70%
1956 0.00% 9.40%
1957 0.00% 8.90%
1958 11.40% 2.40%
1959 0.00% 6.90%
1960 4.50% 2.10%
1961 31.50% 4.80%
1962 12.20% 0.00%
1963 2.20% 8.80%
1964 11.60% 2.20%
1965 11.80% 0.00%
1966 2.40% 10.90%
1967 20.30% 2.20%
1968 2.40% 6.60%
1969 4.30% 0.00%
1970 6.80% 2.40%
1971 16.20% 0.00%
1972 0.00% 14.20%
1973 21.60% 4.80%
1974 9.40% 4.50%
1975 7.10% 0.00%
1976 0.00% 6.80%
1977 2.40% 8.90%
1978 2.60% 4.80%
1979 2.20% 6.90%
1980 0.00% 59.40%
1981 2.20% 4.50%
1982 9.50% 0.00%
1983 2.40% 49.30%
1984 2.20% 9.00%
1985 13.50% 2.30%
1986 9.20% 13.20%
1987 0.00% 16.00%
1988 0.00% 19.70%
1989 42.40% 2.20%
1990 2.40% 29.40%
1991 13.80% 0.00%
1992 16.10% 0.00%
1993 0.00% 30.90%
1994 50.10% 0.00%
1995 4.50% 2.30%
1996 4.30% 6.80%
1997 6.70% 8.80%
1998 2.20% 30.00%
1999 2.40% 15.50%
2000 4.50% 14.80%
2001 6.60% 0.00%
2002 4.70% 4.40%
2003 55.40% 0.00%
2004 23.10% 0.00%
2005 20.40% 0.00%
2006 0.00% 14.70%
2007 0.00% 7.50%
2008 2.40% 6.80%
2009 6.50% 6.80%
2010 2.30% 4.60%
2011 0.00% 14.90%
2012 5.80% 0.00%
2013 56.60% 3.00%
2014 14.30% 8.60%
2015 12.70% 0.00%

*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.