This is the data set used by Tukey (1977) for the initial examples of twoway tables
a matrix of 7 rows (Month) and 3 columns (City) where the value is mean
monthly temperature in degrees F. The matrix has a
Tukey, J. W. (1977). Exploratory Data Analysis, Reading MA: Addison-Wesley. Exhibit 1 of chapter 10, p. 333
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