| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 39°F | 63°F | 50°F | 6.6" |
| February | 41°F | 67°F | 53°F | 7.7" |
| March | 48°F | 73°F | 60°F | 7.4" |
| April | 54°F | 80°F | 67°F | 9.5" |
| May | 62°F | 86°F | 73°F | 7.6" |
| June | 70°F | 91°F | 80°F | 10.6" |
| July | 72°F | 93°F | 81°F | 9.7" |
| August | 73°F | 92°F | 81°F | 9.9" |
| September | 68°F | 87°F | 76°F | 8.3" |
| October | 57°F | 80°F | 67°F | 7.5" |
| November | 46°F | 72°F | 57°F | 5.5" |
| December | 44°F | 67°F | 54°F | 6.6" |
| Index | Gumbranch | Georgia | National |
| Air quality index | 39 | 41 | 42 |
| Pollution index | 367,918 | 1,874,972 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 295 |
| Days with moderate air quality | 70 |
| 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 | 0.001% |
| Lead | 0.005% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Allenhurst, GA | 584 | 39 | 22.0% |
| Walthourville, GA | 4,090 | 39 | 22.0% |
| Glennville, GA | 5,081 | 39 | 22.0% |
| Fort Stewart, GA | 9,765 | 39 | 22.0% |
| Flemington, GA | 949 | 39 | 22.0% |
| Gumbranch, GA | 366 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Gainesville, AL | 366 | 36 | 28.0% |
| Central, AZ | 366 | 47 | 6.0% |
| Clarksburg, CA | 366 | 52 | 4.0% |
| Calamus, IA | 366 | 46 | 8.0% |
| Brewster, KS | 366 | 19 | 62.0% |
| Gumbranch, GA | 366 | 39 | 22.0% |
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