Create the data set and calculate centigrade temperatures. REFLIB.MINNTEMP contains average monthly temperatures for Minneapolis. 
data reflib.minntemp;
   input @10 month
         @23 f2;
   c2=(f2-32)/1.8;
   output;
   datalines;
01JAN83  1    1   40.5  12.2  52.1
01FEB83  2    1   42.2  16.5  55.1
   ...more data lines...
01NOV83  11   4   50.0  32.4  59.8
01DEC83  12   1   41.2  18.6  52.5
;