data citytemp;
   input  Month Fahrenheit City $;
   datalines;
   1      40.5    Raleigh
   1      12.2    Minn
   1      52.1    Phoenix
   2      42.2    Raleigh
   2      16.5    Minn
   2      55.1    Phoenix
   3      49.2    Raleigh
   3      28.3    Minn
   3      59.7    Phoenix
   4      59.5    Raleigh
   4      45.1    Minn
   4      67.7    Phoenix
   5      67.4    Raleigh
   5      57.1    Minn
   5      76.3    Phoenix
   6      74.4    Raleigh
   6      66.9    Minn
   6      84.6    Phoenix
   7      77.5    Raleigh
   7      71.9    Minn
   7      91.2    Phoenix
   8      76.5    Raleigh
   8      70.2    Minn
   8      89.1    Phoenix
   9      70.6    Raleigh
   9      60.0    Minn
   9      83.8    Phoenix
  10      60.2    Raleigh
  10      50.0    Minn
  10      72.2    Phoenix
  11      50.0    Raleigh
  11      32.4    Minn
  11      59.8    Phoenix
  12      41.2    Raleigh
  12      18.6    Minn
  12      52.5    Phoenix
;