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% 41.40%
1911 0.80% 24.20%
1912 15.30% 4.90%
1913 2.30% 17.30%
1914 3.40% 20.20%
1915 11.10% 12.90%
1916 4.00% 17.00%
1917 5.50% 9.10%
1918 0.80% 18.20%
1919 4.00% 7.00%
1920 6.20% 7.20%
1921 2.20% 10.80%
1922 9.40% 4.20%
1923 8.00% 11.30%
1924 5.30% 14.80%
1925 1.30% 30.00%
1926 11.40% 21.30%
1927 14.80% 10.10%
1928 5.20% 15.10%
1929 9.00% 5.30%
1930 2.60% 8.70%
1931 1.50% 12.30%
1932 3.20% 9.50%
1933 7.10% 6.90%
1934 2.40% 36.90%
1935 12.00% 3.10%
1936 3.50% 20.30%
1937 2.70% 5.40%
1938 13.20% 1.50%
1939 1.70% 15.50%
1940 3.50% 4.10%
1941 24.30% 14.30%
1942 3.60% 3.40%
1943 5.60% 3.20%
1944 18.50% 2.00%
1945 15.00% 4.20%
1946 5.40% 4.10%
1947 17.00% 4.10%
1948 13.20% 4.80%
1949 5.20% 4.20%
1950 7.00% 6.00%
1951 7.10% 8.60%
1952 7.50% 5.90%
1953 13.50% 1.30%
1954 1.20% 7.70%
1955 1.90% 10.30%
1956 4.00% 14.60%
1957 34.20% 1.20%
1958 21.20% 7.90%
1959 6.30% 11.10%
1960 6.90% 6.50%
1961 11.50% 4.20%
1962 2.70% 10.00%
1963 7.50% 6.40%
1964 3.00% 4.10%
1965 15.40% 4.80%
1966 2.80% 24.60%
1967 9.60% 9.20%
1968 8.50% 3.20%
1969 2.10% 9.90%
1970 6.60% 3.50%
1971 1.90% 14.50%
1972 5.50% 14.60%
1973 34.10% 4.50%
1974 12.00% 8.60%
1975 22.30% 0.70%
1976 5.00% 4.50%
1977 4.80% 6.50%
1978 7.90% 3.40%
1979 12.80% 1.10%
1980 12.80% 7.70%
1981 6.70% 4.70%
1982 13.30% 1.50%
1983 28.60% 1.00%
1984 20.30% 3.60%
1985 3.20% 5.40%
1986 3.60% 7.90%
1987 7.00% 7.20%
1988 1.30% 12.80%
1989 11.20% 8.40%
1990 16.60% 2.10%
1991 22.00% 1.90%
1992 11.50% 9.70%
1993 17.60% 0.80%
1994 4.30% 13.30%
1995 33.30% 2.40%
1996 7.20% 11.90%
1997 8.20% 7.10%
1998 18.20% 6.30%
1999 6.40% 3.70%
2000 2.70% 5.60%
2001 3.80% 5.80%
2002 7.10% 11.10%
2003 15.20% 5.30%
2004 10.90% 11.10%
2005 8.30% 6.30%
2006 11.20% 8.10%
2007 8.90% 16.90%
2008 4.00% 9.60%
2009 7.60% 2.20%
2010 8.00% 5.40%
2011 37.80% 11.30%
2012 8.40% 15.70%
2013 8.00% 8.10%
2014 4.30% 4.60%
2015 24.10% 3.70%

*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.