Create the data set and calculate centigrade temperatures. MINNTEMP contains average monthly temperatures for Minneapolis.

data minntemp;
   input @10 month
         @23 f2;     /* fahrenheit temperature for Minneapolis */
         c2=(f2-32)/1.8; /* calculate centigrade temperature */
                         /* for Minneapolis                  */
   output;
   datalines;
01JAN83  1    1   40.5  12.2  52.1
01FEB83  2    1   42.2  16.5  55.1
01MAR83  3    2   49.2  28.3  59.7
01APR83  4    2   59.5  45.1  67.7
01MAY83  5    2   67.4  57.1  76.3
01JUN83  6    3   74.4  66.9  84.6
01JUL83  7    3   77.5  71.9  91.2
01AUG83  8    3   76.5  70.2  89.1
01SEP83  9    4   70.6  60.0  83.8
01OCT83  10   4   60.2  50.0  72.2
01NOV83  11   4   50.0  32.4  59.8
01DEC83  12   1   41.2  18.6  52.5
;