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
1910 8.30%
1911 14.30%
1912 6.20%
1913 7.60%
1914 18.20%
1915 13.10%
1916 7.40%
1917 1.30%
1918 7.50%
1919 8.80%
1920 7.40%
1921 15.40%
1922 7.20%
1923 10.90%
1924 1.30%
1925 8.10%
1926 2.50%
1927 9.50%
1928 7.00%
1929 6.30%
1930 7.00%
1931 7.20%
1932 5.80%
1933 18.10%
1934 8.30%
1935 13.20%
1936 14.20%
1937 1.20%
1938 18.30%
1939 3.50%
1940 6.00%
1941 12.20%
1942 11.70%
1943 5.90%
1944 3.50%
1945 12.00%
1946 12.10%
1947 3.10%
1948 5.90%
1949 8.70%
1950 9.30%
1951 10.50%
1952 6.00%
1953 10.70%
1954 9.40%
1955 10.40%
1956 1.20%
1957 12.90%
1958 4.70%
1959 7.20%
1960 5.90%
1961 14.30%
1962 8.00%
1963 8.30%
1964 13.30%
1965 17.60%
1966 14.70%
1967 10.60%
1968 7.00%
1969 8.10%
1970 3.50%
1971 8.20%
1972 5.70%
1973 18.00%
1974 16.50%
1975 5.70%
1976 5.50%
1977 7.90%
1978 8.20%
1979 15.70%
1980 12.30%
1981 10.80%
1982 6.20%
1983 13.10%
1984 6.00%
1985 20.30%
1986 16.40%
1987 7.20%
1988 6.90%
1989 8.30%
1990 11.80%
1991 15.80%
1992 3.90%
1993 6.10%
1994 8.60%
1995 22.30%
1996 22.30%
1997 12.60%
1998 30.60%
1999 13.00%
2000 4.90%
2001 16.70%
2002 16.00%
2003 9.10%
2004 6.00%
2005 14.60%
2006 13.30%
2007 19.30%
2008 23.60%
2009 17.40%
2010 15.60%
2011 15.10%
2012 13.90%
2013 15.90%
2014 14.20%

*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.