| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 32°F | 58°F | 44°F | 4.0" |
| February | 33°F | 59°F | 45°F | 8.1" |
| March | 40°F | 69°F | 53°F | 9.3" |
| April | 43°F | 72°F | 57°F | 4.8" |
| May | 51°F | 81°F | 66°F | 4.7" |
| June | 63°F | 87°F | 74°F | 5.5" |
| July | 68°F | 88°F | 76°F | 12.3" |
| August | 70°F | 91°F | 79°F | 7.5" |
| September | 62°F | 86°F | 73°F | 1.3" |
| October | 51°F | 76°F | 62°F | 2.2" |
| November | 39°F | 67°F | 51°F | 4.6" |
| December | 33°F | 58°F | 45°F | 6.9" |
| Index | Grantville | Georgia | National |
| Air quality index | 52 | 41 | 42 |
| Pollution index | 4,626,350 | 1,874,972 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 162 |
| Days with moderate air quality | 184 |
| Days w/ poor A.Q. for sensitive groups | 18 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.040% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.020% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Hogansville, GA | 3,165 | 42 | 16.0% |
| LaGrange, GA | 30,494 | 42 | 16.0% |
| Gay, GA | 122 | 42 | 16.0% |
| Lone Oak, GA | 77 | 42 | 16.0% |
| Greenville, GA | 1,002 | 42 | 16.0% |
| Grantville, GA | 3,273 | 52 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Blountstown, FL | 3,273 | 38 | 24.0% |
| Ponce Inlet, FL | 3,272 | 37 | 26.0% |
| Beaumont, QC | 3,274 | n/a | |
| Melancthon, ON | 3,274 | n/a | |
| West DeLand, FL | 3,271 | 37 | 26.0% |
| Grantville, GA | 3,273 | 52 | 4.0% |
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