| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 55°F | 45°F | 5.9" |
| February | 36°F | 56°F | 45°F | 6.9" |
| March | 43°F | 67°F | 55°F | 11.0" |
| April | 48°F | 71°F | 59°F | 6.6" |
| May | 56°F | 79°F | 68°F | 6.1" |
| June | 66°F | 86°F | 75°F | 8.7" |
| July | 70°F | 86°F | 77°F | 6.9" |
| August | 72°F | 92°F | 80°F | 9.5" |
| September | 65°F | 85°F | 75°F | 4.2" |
| October | 55°F | 74°F | 64°F | 6.6" |
| November | 42°F | 64°F | 52°F | 4.7" |
| December | 36°F | 54°F | 44°F | 7.6" |
| Index | Nelson | Georgia | National |
| Air quality index | 37 | 41 | 42 |
| Pollution index | 496,082 | 1,874,972 | 2,726,193 |
| Measurement | Total |
| Days measured | 340 |
| Days with good air quality | 259 |
| Days with moderate air quality | 81 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Ball Ground, GA | 2,230 | 37 | 26.0% |
| Jasper, GA | 3,923 | 37 | 26.0% |
| Cumming, GA | 6,528 | 37 | 26.0% |
| Dawsonville, GA | 3,065 | 37 | 26.0% |
| Talking Rock, GA | 110 | 43 | 14.0% |
| Nelson, GA | 1,302 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Westhaven-Moonstone, CA | 1,302 | 27 | 46.0% |
| Jonesboro, IN | 1,302 | 35 | 30.0% |
| Labadieville, LA | 1,302 | 41 | 18.0% |
| Brilliant, OH | 1,302 | 46 | 8.0% |
| L'Isle-aux-Allumettes, QC | 1,302 | n/a | |
| Nelson, GA | 1,302 | 37 | 26.0% |
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