| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 57°F | 45°F | 4.9" |
| February | 35°F | 58°F | 46°F | 8.7" |
| March | 43°F | 68°F | 55°F | 9.3" |
| April | 47°F | 72°F | 59°F | 8.7" |
| May | 56°F | 81°F | 68°F | 6.6" |
| June | 66°F | 88°F | 76°F | 6.3" |
| July | 69°F | 88°F | 77°F | 12.9" |
| August | 71°F | 93°F | 80°F | 9.3" |
| September | 65°F | 87°F | 75°F | 4.1" |
| October | 54°F | 76°F | 64°F | 6.4" |
| November | 41°F | 66°F | 52°F | 4.0" |
| December | 36°F | 56°F | 45°F | 8.1" |
| Index | Mountain Park city | Georgia | National |
| Air quality index | 52 | 41 | 42 |
| Pollution index | 13,513,500 | 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 | 0.170% |
| Benzene | 0.180% |
| Carbon Tetrachloride | 0.040% |
| Lead | 0.080% |
| Mercury | 0.005% |
| City | Population | Air Quality Index | National Avg. |
| Lawrenceville, GA | 30,125 | 37 | 26.0% |
| Dacula, GA | 6,175 | 37 | 26.0% |
| Suwanee, GA | 20,444 | 37 | 26.0% |
| Roswell, GA | 94,884 | 52 | 4.0% |
| Candler-McAfee, GA | 24,419 | 52 | 4.0% |
| Mountain Park city, GA | 638 | 52 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Elgin, IA | 638 | 39 | 22.0% |
| Oretta, LA | 638 | 45 | 10.0% |
| Lake Benton, MN | 638 | 42 | 16.0% |
| Alton, MO | 638 | 36 | 28.0% |
| Warner, NH | 638 | 27 | 46.0% |
| Mountain Park city, GA | 638 | 52 | 4.0% |
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