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 7.60%
1912 0.00%
1913 12.70%
1914 20.00%
1915 23.50%
1916 13.40%
1917 7.20%
1918 18.60%
1919 7.20%
1920 0.00%
1921 14.20%
1922 0.00%
1923 0.00%
1924 21.60%
1925 0.00%
1926 0.00%
1927 5.80%
1928 17.70%
1929 0.00%
1930 5.80%
1931 0.00%
1932 0.00%
1933 27.70%
1934 0.00%
1935 0.00%
1936 11.80%
1937 11.80%
1938 5.70%
1939 0.00%
1940 0.00%
1941 0.00%
1942 5.50%
1943 0.00%
1944 12.10%
1945 0.00%
1946 0.00%
1947 11.10%
1948 0.00%
1949 0.00%
1950 0.00%
1951 39.10%
1952 22.10%
1953 21.80%
1954 0.00%
1955 16.80%
1956 16.50%
1957 0.00%
1958 0.00%
1959 0.00%
1960 22.20%
1961 5.80%
1962 0.00%
1963 0.00%
1964 24.00%
1965 5.90%
1966 0.00%
1967 0.00%
1968 0.00%
1969 10.80%
1970 11.60%
1971 5.70%
1972 0.00%
1973 27.90%
1974 6.30%
1975 0.00%
1976 17.50%
1977 33.40%
1978 38.50%
1979 6.20%
1980 5.80%
1981 0.00%
1982 0.00%
1983 5.60%
1984 33.40%
1985 5.80%
1986 0.00%
1987 11.20%
1988 0.00%
1989 0.00%
1990 0.00%
1991 22.00%
1992 6.10%
1993 5.70%
1994 5.80%
1995 5.90%
1996 44.70%
1997 28.10%
1998 5.60%
1999 23.40%
2000 16.70%
2001 5.90%
2002 6.40%
2003 6.60%
2004 5.70%
2005 0.00%
2006 43.60%
2007 43.90%
2008 46.90%
2009 11.90%
2010 23.40%
2011 62.30%
2012 6.30%
2013 6.70%
2014 0.00%
2015 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.