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% 31.50%
1911 12.90% 30.70%
1912 0.00% 12.60%
1913 9.70% 33.10%
1914 4.70% 18.90%
1915 0.00% 27.40%
1916 14.20% 9.50%
1917 4.80% 14.80%
1918 0.00% 14.90%
1919 5.50% 5.30%
1920 0.00% 9.60%
1921 0.00% 23.70%
1922 0.00% 42.20%
1923 0.00% 44.00%
1924 0.00% 49.70%
1925 5.20% 5.20%
1926 4.90% 4.80%
1927 4.60% 4.70%
1928 0.00% 9.10%
1929 8.50% 4.40%
1930 0.00% 45.70%
1931 0.00% 32.30%
1932 0.00% 29.00%
1933 0.00% 22.50%
1934 0.00% 31.80%
1935 13.80% 17.80%
1936 8.90% 4.50%
1937 8.50% 8.50%
1938 8.70% 0.00%
1939 8.70% 12.90%
1940 13.30% 4.30%
1941 0.00% 47.70%
1942 9.10% 4.40%
1943 4.50% 4.40%
1944 0.00% 31.40%
1945 59.30% 0.00%
1946 0.00% 18.40%
1947 4.40% 8.70%
1948 9.00% 12.60%
1949 0.00% 4.40%
1950 26.60% 0.00%
1951 8.40% 0.00%
1952 0.00% 8.70%
1953 0.00% 4.20%
1954 25.50% 4.50%
1955 0.00% 9.30%
1956 17.60% 0.00%
1957 0.00% 25.70%
1958 0.00% 0.00%
1959 0.00% 0.00%
1960 0.00% 0.00%
1961 0.00% 4.30%
1962 0.00% 13.20%
1963 0.00% 17.70%
1964 0.00% 13.00%
1965 0.00% 0.00%
1966 0.00% 8.70%
1967 0.00% 0.00%
1968 4.30% 4.50%
1969 0.00% 4.30%
1970 17.60% 0.00%
1971 0.00% 8.60%
1972 50.40% 0.00%
1973 4.60% 0.00%
1974 13.50% 4.70%
1975 19.30% 0.00%
1976 17.20% 4.50%
1977 17.00% 0.00%
1978 0.00% 17.90%
1979 13.20% 4.30%
1980 0.00% 8.80%
1981 4.50% 0.00%
1982 0.00% 4.50%
1983 0.00% 0.00%
1984 13.80% 0.00%
1985 30.10% 0.00%
1986 4.80% 0.00%
1987 0.00% 4.30%
1988 4.60% 9.30%
1989 32.00% 0.00%
1990 8.70% 0.00%
1991 0.00% 17.40%
1992 26.20% 4.20%
1993 18.00% 0.00%
1994 4.40% 4.40%
1995 0.00% 12.90%
1996 43.30% 0.00%
1997 21.40% 4.20%
1998 4.30% 4.30%
1999 0.00% 26.30%
2000 17.20% 8.90%
2001 4.40% 22.10%
2002 13.50% 9.10%
2003 62.30% 0.00%
2004 43.60% 0.00%
2005 17.20% 0.00%
2006 26.80% 4.70%
2007 0.00% 9.70%
2008 61.70% 4.70%
2009 20.10% 5.00%
2010 0.00% 15.30%
2011 68.10% 0.00%
2012 10.00% 10.20%
2013 27.50% 5.60%
2014 27.50% 0.00%
2015 12.00% 11.70%

*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.