| 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 | Monticello | Georgia | National |
| Air quality index | 38 | 41 | 42 |
| Pollution index | 1,832,620 | 1,874,972 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 278 |
| Days with moderate air quality | 84 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.030% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.020% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Shady Dale, GA | 408 | 38 | 24.0% |
| Flovilla, GA | 1,010 | 38 | 24.0% |
| Mansfield, GA | 533 | 44 | 12.0% |
| Newborn, GA | 817 | 44 | 12.0% |
| Monticello, GA | 2,687 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Tobaccoville, NC | 2,687 | 45 | 10.0% |
| Aspinwall, PA | 2,687 | 56 | 12.0% |
| Roseau, MN | 2,686 | 33 | 34.0% |
| Bel-Ridge, MO | 2,686 | 54 | 8.0% |
| Arlington, NY | 2,686 | 36 | 28.0% |
| Monticello, GA | 2,687 | 38 | 24.0% |
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