| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 61°F | 47°F | 4.1" |
| February | 36°F | 65°F | 49°F | 4.5" |
| March | 42°F | 73°F | 57°F | 3.4" |
| April | 49°F | 80°F | 64°F | 4.5" |
| May | 57°F | 86°F | 72°F | 2.5" |
| June | 67°F | 93°F | 79°F | 4.7" |
| July | 70°F | 94°F | 81°F | 5.2" |
| August | 70°F | 93°F | 80°F | 4.7" |
| September | 64°F | 89°F | 75°F | 3.6" |
| October | 51°F | 80°F | 64°F | 2.3" |
| November | 40°F | 71°F | 54°F | 3.2" |
| December | 38°F | 64°F | 50°F | 6.4" |
| Index | Marshallville | Georgia | National |
| Air quality index | 38 | 41 | 42 |
| Pollution index | 760,415 | 1,874,972 | 2,726,193 |
| Measurement | Total |
| Days measured | 354 |
| Days with good air quality | 246 |
| Days with moderate air quality | 106 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Byron, GA | 5,170 | 38 | 24.0% |
| Unadilla, GA | 3,557 | 38 | 24.0% |
| Centerville, GA | 7,821 | 38 | 24.0% |
| Fort Valley, GA | 8,817 | 38 | 24.0% |
| Perry, GA | 17,235 | 38 | 24.0% |
| Marshallville, GA | 1,284 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Pine Knoll Shores, NC | 1,284 | 37 | 26.0% |
| Harrisville, RI | 1,284 | 44 | 12.0% |
| Addison (Webster Springs), WV | 1,284 | 31 | 38.0% |
| Barrackville, WV | 1,284 | 31 | 38.0% |
| Hudson Lake, IN | 1,285 | 42 | 16.0% |
| Marshallville, GA | 1,284 | 38 | 24.0% |
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