| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 37°F | 56°F | 45°F | 4.3" |
| February | 39°F | 58°F | 48°F | 3.4" |
| March | 47°F | 68°F | 57°F | 5.1" |
| April | 55°F | 77°F | 65°F | 5.7" |
| May | 62°F | 83°F | 72°F | 4.8" |
| June | 71°F | 91°F | 80°F | 3.1" |
| July | 74°F | 93°F | 82°F | 3.5" |
| August | 73°F | 93°F | 82°F | 4.1" |
| September | 66°F | 87°F | 76°F | 3.2" |
| October | 54°F | 77°F | 65°F | 4.6" |
| November | 45°F | 66°F | 54°F | 3.8" |
| December | 39°F | 57°F | 47°F | 6.1" |
| Index | Monticello | Arkansas | National |
| Air quality index | 35 | 38 | 42 |
| Pollution index | 604,854 | 1,487,822 | 2,726,193 |
| Measurement | Total |
| Days measured | 241 |
| Days with good air quality | 196 |
| Days with moderate air quality | 45 |
| 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 | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Wilmar, AR | 274 | 35 | 30.0% |
| Rye, AR | 144 | 35 | 30.0% |
| Monticello, AR | 9,392 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Greenwood, AR | 9,392 | 36 | 28.0% |
| Cairo, GA | 9,395 | 40 | 20.0% |
| Coaldale, AB | 9,383 | n/a | |
| Fairview, OR | 9,382 | 38 | 24.0% |
| Audubon, PA | 9,379 | 51 | 2.0% |
| Monticello, AR | 9,392 | 35 | 30.0% |
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