| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 55°F | 76°F | 64°F | 3.0" |
| February | 56°F | 78°F | 66°F | 1.9" |
| March | 59°F | 81°F | 69°F | 2.3" |
| April | 64°F | 86°F | 75°F | 2.2" |
| May | 69°F | 90°F | 79°F | 3.2" |
| June | 74°F | 91°F | 81°F | 9.9" |
| July | 75°F | 92°F | 82°F | 10.4" |
| August | 76°F | 92°F | 82°F | 10.7" |
| September | 74°F | 91°F | 81°F | 9.1" |
| October | 69°F | 87°F | 77°F | 4.0" |
| November | 61°F | 82°F | 70°F | 1.5" |
| December | 59°F | 79°F | 68°F | 1.8" |
| Index | St. James City | Florida | National |
| Air quality index | 36 | 35 | 42 |
| Pollution index | 58,201,700 | 7,570,785 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 328 |
| Days with moderate air quality | 36 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 1.330% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Cypress Lake, FL | 12,766 | 36 | 28.0% |
| Iona, FL | 13,588 | 36 | 28.0% |
| Palmona Park, FL | 754 | 36 | 28.0% |
| Suncoast Estates, FL | 4,759 | 36 | 28.0% |
| Matlacha, FL | 853 | 36 | 28.0% |
| St. James City, FL | 3,510 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Robins, IA | 3,510 | 39 | 22.0% |
| Mission Hills, CA | 3,509 | 46 | 8.0% |
| Pajaro, CA | 3,509 | 37 | 26.0% |
| Central Kootenay J, BC | 3,509 | n/a | |
| Monte Sereno, CA | 3,511 | 43 | 14.0% |
| St. James City, FL | 3,510 | 36 | 28.0% |
Here are the best places to live in Florida
Check out the 10 most dangerous cities in Florida
These are the 10 cheapest cities in Florida
Safest States In The US