| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 39°F | 67°F | 53°F | 4.1" |
| February | 40°F | 70°F | 54°F | 5.0" |
| March | 46°F | 77°F | 61°F | 4.3" |
| April | 53°F | 83°F | 68°F | 4.9" |
| May | 61°F | 89°F | 75°F | 2.9" |
| June | 70°F | 94°F | 80°F | 7.6" |
| July | 72°F | 94°F | 81°F | 6.5" |
| August | 73°F | 94°F | 82°F | 8.3" |
| September | 69°F | 91°F | 79°F | 3.9" |
| October | 57°F | 84°F | 70°F | 2.7" |
| November | 46°F | 76°F | 60°F | 3.5" |
| December | 43°F | 70°F | 56°F | 5.7" |
| Index | Monticello | Florida | National |
| Air quality index | 40 | 35 | 42 |
| Pollution index | 2,420,530 | 7,570,785 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 272 |
| Days with moderate air quality | 92 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.070% |
| Mercury | 0.004% |
| City | Population | Air Quality Index | National Avg. |
| Greenville, FL | 1,358 | 35 | 30.0% |
| Lamont, FL | 32 | 40 | 20.0% |
| Lloyd, FL | 119 | 40 | 20.0% |
| Aucilla, FL | 157 | 40 | 20.0% |
| Wacissa, FL | 358 | 40 | 20.0% |
| Monticello, FL | 2,259 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Melrose Park, NY | 2,259 | 37 | 26.0% |
| Redwater, AB | 2,259 | n/a | |
| Lake Village, AR | 2,258 | 43 | 14.0% |
| Colfax, CA | 2,258 | 44 | 12.0% |
| Bolindale, OH | 2,258 | 42 | 16.0% |
| Monticello, FL | 2,259 | 40 | 20.0% |
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