| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 39°F | 64°F | 50°F | 3.7" |
| February | 40°F | 66°F | 52°F | 4.6" |
| March | 47°F | 74°F | 60°F | 3.7" |
| April | 54°F | 81°F | 67°F | 4.7" |
| May | 62°F | 88°F | 74°F | 2.2" |
| June | 71°F | 93°F | 80°F | 5.1" |
| July | 73°F | 94°F | 82°F | 4.9" |
| August | 73°F | 93°F | 81°F | 5.8" |
| September | 68°F | 90°F | 77°F | 2.9" |
| October | 56°F | 82°F | 68°F | 2.1" |
| November | 45°F | 73°F | 58°F | 2.2" |
| December | 43°F | 67°F | 53°F | 5.6" |
| Index | Plains | Georgia | National |
| Air quality index | 39 | 41 | 42 |
| Pollution index | 162,629 | 1,874,972 | 2,726,193 |
| Measurement | Total |
| Days measured | 238 |
| Days with good air quality | 211 |
| Days with moderate air quality | 27 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.003% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Ellaville, GA | 1,880 | 39 | 22.0% |
| Smithville, GA | 462 | 39 | 22.0% |
| Bronwood, GA | 319 | 39 | 22.0% |
| Parrott, GA | 130 | 39 | 22.0% |
| Americus, GA | 15,319 | 39 | 22.0% |
| Plains, GA | 758 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Hartford, AR | 758 | 36 | 28.0% |
| Milner, GA | 758 | 38 | 24.0% |
| Arco, ID | 758 | 27 | 46.0% |
| Boswell, IN | 758 | 42 | 16.0% |
| Hamlet, IN | 758 | 42 | 16.0% |
| Plains, GA | 758 | 39 | 22.0% |
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