Franklin County weather is generally temperate, even on the hottest summer days you can generally catch a cooling sea breeze. The winters are wonderful - brisk nights and sunny cool days.
| MONTH | WATER TEMP | AIR TEMP |
| January | 64 | 54 |
| February | 64 | 56 |
| March | 72 | 61 |
| April | 73 | 68 |
| May | 79 | 74 |
| June | 82 | 80 |
| July | 83 | 81 |
| August | 83 | 81 |
| September | 83 | 79 |
| October | 81 | 71 |
| November | 73 | 61 |
| December | 70 | 56 |