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 Percent
1911 15.70%
1912 14.90%
1913 14.30%
1914 19.10%
1915 10.90%
1916 15.60%
1917 8.50%
1918 8.20%
1919 13.30%
1920 17.50%
1921 12.60%
1922 18.40%
1923 11.00%
1924 6.00%
1925 10.00%
1926 10.10%
1927 9.70%
1928 11.20%
1929 5.20%
1930 8.30%
1931 12.90%
1932 8.90%
1933 8.10%
1934 10.80%
1935 10.70%
1936 7.70%
1937 9.90%
1938 10.40%
1939 5.50%
1940 6.00%
1941 7.80%
1942 13.80%
1943 11.60%
1944 7.70%
1945 6.20%
1946 5.30%
1947 9.30%
1948 3.60%
1949 8.30%
1950 9.00%
1951 11.10%
1952 9.60%
1953 10.10%
1954 16.40%
1955 5.00%
1956 8.30%
1957 3.20%
1958 7.10%
1959 4.70%
1960 7.30%
1961 7.60%
1962 7.50%
1963 6.50%
1964 3.70%
1965 10.60%
1966 9.70%
1967 9.80%
1968 3.30%
1969 5.80%
1970 14.00%
1971 7.50%
1972 6.70%
1973 13.20%
1974 13.00%
1975 3.20%
1976 10.30%
1977 7.80%
1978 6.60%
1979 3.90%
1980 12.80%
1981 12.10%
1982 12.70%
1983 15.90%
1984 11.60%
1985 10.20%
1986 12.80%
1987 7.80%
1988 4.70%
1989 6.80%
1990 8.00%
1991 14.00%
1992 9.20%
1993 8.80%
1994 6.70%
1995 15.90%
1996 21.30%
1997 18.10%
1998 10.20%
1999 20.40%
2000 6.70%
2001 9.80%
2002 13.70%
2003 11.20%
2004 7.80%
2005 9.80%
2006 19.80%
2007 23.30%
2008 16.90%
2009 14.00%
2010 14.30%
2011 12.30%
2012 16.50%
2013 7.70%
2014 7.70%
2015 8.30%

*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.