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% 61.70%
1911 9.00% 12.50%
1912 0.00% 24.70%
1913 0.00% 15.80%
1914 33.10% 7.60%
1915 3.80% 11.70%
1916 0.00% 11.20%
1917 0.00% 30.40%
1918 11.50% 3.80%
1919 12.00% 11.10%
1920 4.10% 23.80%
1921 4.00% 18.60%
1922 4.30% 20.60%
1923 10.90% 7.50%
1924 0.00% 48.00%
1925 3.50% 15.10%
1926 23.20% 7.20%
1927 4.00% 0.00%
1928 3.50% 15.00%
1929 0.00% 17.80%
1930 7.80% 7.20%
1931 18.60% 13.60%
1932 0.00% 18.40%
1933 0.00% 13.50%
1934 0.00% 34.70%
1935 0.00% 7.30%
1936 3.70% 7.40%
1937 0.00% 7.20%
1938 3.40% 7.40%
1939 0.00% 32.90%
1940 7.40% 0.00%
1941 64.70% 0.00%
1942 3.80% 12.50%
1943 0.00% 14.40%
1944 7.60% 7.40%
1945 10.50% 11.50%
1946 7.50% 3.60%
1947 7.80% 0.00%
1948 0.00% 22.20%
1949 15.50% 0.00%
1950 0.00% 45.40%
1951 7.40% 0.00%
1952 0.00% 0.00%
1953 0.00% 39.70%
1954 0.00% 17.50%
1955 3.40% 7.40%
1956 0.00% 51.30%
1957 57.10% 0.00%
1958 24.50% 3.90%
1959 7.20% 7.00%
1960 7.20% 3.50%
1961 17.50% 0.00%
1962 0.00% 7.00%
1963 10.20% 7.20%
1964 0.00% 10.90%
1965 35.20% 0.00%
1966 0.00% 17.60%
1967 3.40% 3.70%
1968 3.70% 0.00%
1969 15.20% 0.00%
1970 7.00% 15.50%
1971 3.40% 3.80%
1972 0.00% 0.00%
1973 3.60% 3.90%
1974 0.00% 10.80%
1975 7.70% 15.60%
1976 0.00% 14.30%
1977 0.00% 7.20%
1978 27.60% 10.90%
1979 0.00% 0.00%
1980 7.40% 14.90%
1981 10.40% 0.00%
1982 25.90% 0.00%
1983 61.70% 0.00%
1984 32.30% 0.00%
1985 14.30% 0.00%
1986 23.30% 0.00%
1987 33.20% 0.00%
1988 7.20% 3.60%
1989 3.70% 34.20%
1990 25.90% 0.00%
1991 14.30% 3.70%
1992 38.00% 0.00%
1993 22.20% 0.00%
1994 7.30% 0.00%
1995 10.60% 3.80%
1996 10.60% 11.50%
1997 22.50% 0.00%
1998 32.70% 3.80%
1999 3.60% 3.80%
2000 3.40% 0.00%
2001 3.80% 0.00%
2002 0.00% 25.00%
2003 0.00% 7.60%
2004 11.60% 0.00%
2005 3.50% 0.00%
2006 0.00% 4.00%
2007 7.00% 10.60%
2008 4.20% 4.50%
2009 8.20% 8.90%
2010 3.80% 0.00%
2011 10.20% 5.10%
2012 0.00% 25.30%
2013 8.90% 0.00%
2014 25.10% 4.20%
2015 47.80% 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.