| Months | p at 10˚N | p at 15˚N | p at 12.95˚N |
| January | 0.26 | 0.26 | 0.26 |
| February | 0.27 | 0.26 | 0.2641 |
| March | 0.27 | 0.27 | 0.27 |
| April | 0.28 | 0.28 | 0.28 |
| May | 0.28 | 0.29 | 0.2941 |
| June | 0.29 | 0.29 | 0.29 |
| July | 0.29 | 0.29 | 0.29 |
| August | 0.28 | 0.28 | 0.28 |
| September | 0.28 | 0.28 | 0.28 |
| October | 0.27 | 0.27 | 0.27 |
| November | 0.26 | 0.26 | 0.26 |
| December | 0.26 | 0.25 | 0.2541 |