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% 45.00%
1911 3.90% 9.20%
1912 3.70% 18.60%
1913 8.80% 5.00%
1914 3.70% 13.00%
1915 17.10% 12.30%
1916 0.00% 40.20%
1917 0.00% 48.20%
1918 0.00% 14.70%
1919 13.80% 1.10%
1920 0.00% 4.70%
1921 0.00% 29.40%
1922 5.20% 6.20%
1923 29.60% 0.00%
1924 0.00% 40.60%
1925 0.00% 25.60%
1926 3.70% 5.90%
1927 5.80% 12.30%
1928 2.30% 7.40%
1929 12.40% 5.00%
1930 3.70% 10.70%
1931 4.80% 6.10%
1932 9.50% 2.40%
1933 0.00% 19.00%
1934 1.20% 31.30%
1935 17.00% 10.70%
1936 2.50% 29.40%
1937 9.40% 2.30%
1938 0.00% 12.70%
1939 0.00% 14.90%
1940 8.00% 0.00%
1941 46.60% 1.20%
1942 10.10% 1.20%
1943 0.00% 27.90%
1944 15.40% 2.40%
1945 20.10% 6.10%
1946 6.40% 2.50%
1947 0.00% 3.30%
1948 6.00% 1.30%
1949 37.80% 0.00%
1950 10.80% 2.50%
1951 20.50% 5.00%
1952 0.00% 20.00%
1953 0.00% 10.50%
1954 0.00% 44.80%
1955 0.00% 13.90%
1956 0.00% 30.60%
1957 58.40% 0.00%
1958 23.50% 1.20%
1959 14.50% 2.40%
1960 14.50% 1.20%
1961 18.80% 0.00%
1962 4.60% 3.50%
1963 0.00% 24.90%
1964 0.00% 5.90%
1965 2.20% 2.40%
1966 1.20% 16.60%
1967 3.40% 2.40%
1968 28.80% 4.40%
1969 12.30% 3.50%
1970 2.30% 12.50%
1971 7.20% 1.20%
1972 6.90% 2.40%
1973 47.80% 0.00%
1974 14.00% 5.70%
1975 16.50% 1.10%
1976 7.20% 13.40%
1977 4.40% 4.80%
1978 2.40% 3.40%
1979 11.20% 1.10%
1980 0.00% 16.70%
1981 7.30% 3.60%
1982 14.50% 0.00%
1983 16.00% 1.20%
1984 12.80% 1.20%
1985 9.30% 1.20%
1986 17.00% 0.00%
1987 10.80% 0.00%
1988 0.00% 15.60%
1989 7.10% 2.40%
1990 12.80% 1.20%
1991 42.00% 0.00%
1992 43.00% 1.20%
1993 25.90% 0.00%
1994 10.00% 4.80%
1995 7.50% 3.70%
1996 3.50% 6.20%
1997 23.20% 0.00%
1998 3.40% 4.70%
1999 1.10% 22.80%
2000 1.20% 13.50%
2001 3.70% 4.60%
2002 4.90% 4.60%
2003 3.60% 11.60%
2004 33.30% 2.30%
2005 2.40% 17.20%
2006 0.00% 18.40%
2007 32.40% 9.80%
2008 4.90% 11.50%
2009 24.50% 2.70%
2010 1.20% 16.00%
2011 0.00% 32.80%
2012 1.30% 30.70%
2013 6.60% 2.70%
2014 3.10% 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.