| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 39°F | 62°F | 49°F | 5.7" |
| February | 42°F | 65°F | 52°F | 5.2" |
| March | 49°F | 72°F | 59°F | 6.1" |
| April | 55°F | 79°F | 66°F | 4.3" |
| May | 62°F | 84°F | 72°F | 4.7" |
| June | 70°F | 91°F | 79°F | 3.7" |
| July | 71°F | 91°F | 80°F | 6.4" |
| August | 72°F | 92°F | 80°F | 6.5" |
| September | 67°F | 88°F | 76°F | 4.5" |
| October | 56°F | 80°F | 67°F | 3.6" |
| November | 46°F | 70°F | 57°F | 3.1" |
| December | 43°F | 63°F | 52°F | 6.5" |
| Index | Monticello | Mississippi | National |
| Air quality index | 35 | 40 | 42 |
| Pollution index | 364,090 | 1,514,109 | 2,726,193 |
| Measurement | Total |
| Days measured | 358 |
| Days with good air quality | 298 |
| Days with moderate air quality | 60 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Prentiss, MS | 1,204 | 35 | 30.0% |
| Silver Creek, MS | 176 | 35 | 30.0% |
| New Hebron, MS | 654 | 44 | 12.0% |
| Monticello, MS | 1,380 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Robie Creek, ID | 1,380 | 36 | 28.0% |
| Greenville, IN | 1,380 | 49 | 2.0% |
| Shepherd, MI | 1,380 | 26 | 48.0% |
| Ellington, MO | 1,380 | 54 | 8.0% |
| Castle Dale, UT | 1,380 | 46 | 8.0% |
| Monticello, MS | 1,380 | 35 | 30.0% |
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