| 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 | Walnut Grove | Georgia | National |
| Air quality index | 44 | 41 | 50 |
| Pollution index | 13,513,500 | 3,237,553 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 245 |
| Days with moderate air quality | 120 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.170% |
| Benzene | 0.180% |
| Carbon Tetrachloride | 0.040% |
| Lead | 0.080% |
| Mercury | 0.005% |
| City, State | Population | Air Quality Index | National Avg. |
| Lawrenceville, GA | 30,127 | 37 | 26% |
| Between, GA | 275 | 44 | 12% |
| Monroe, GA | 13,253 | 44 | 12% |
| Jersey, GA | 143 | 44 | 12% |
| Bethlehem, GA | 782 | 44 | 12% |
| Walnut Grove, GA | 1,181 | 44 | 12% |
| City, State | Population | Air Quality Index | National Avg. |
| Jonesville, VA | 1,181 | 45 | 10% |
| Parachute, CO | 1,181 | 44 | 12% |
| Marvell, AR | 1,181 | 43 | 14% |
| Mounds, OK | 1,181 | 45 | 10% |
| Keedysville, MD | 1,181 | 40 | 20% |
| Walnut Grove, GA | 1,181 | 44 | 12% |
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