Data are stored in ASCII

All values are integers
Temperatures are stored as degrees C * 100
100% sea-ice-covered gridboxes are flagged as -1000
Land squares are set to -32768

The day, month and year are stored at the start of each month. The day simply tells
you on which day the month starts.

Data Array (360x180)
Item (  1,  1) stores the value for the 1-deg-area centred at 179.5W and 89.5N
Item (360,180) stores the value for the 1-deg-area centred at 179.5E and 89.5S

          ----- ----- -----
         |     |     |     |
         | DAY | MON | YR  |
         |_____|_____|_____|____________________________
     90N |(1,1)                                         |
         |                                              |
         |                                              |
         |                                              |
         |                                              |
         |(1,90)                                        |
     Equ |                                              |
         |(1,91)                                        |
         |                                              |
         |                                              |
         |                                              |
         |                                              |
     90S |(1,180)______________________________(360,180)|
          180W                 0                    180E