| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 46°F | 35°F | 5.6" |
| February | 26°F | 50°F | 38°F | 4.7" |
| March | 36°F | 62°F | 49°F | 6.8" |
| April | 44°F | 72°F | 58°F | 8.0" |
| May | 54°F | 78°F | 66°F | 8.3" |
| June | 61°F | 86°F | 73°F | 5.2" |
| July | 64°F | 88°F | 75°F | 8.5" |
| August | 63°F | 87°F | 74°F | 6.8" |
| September | 57°F | 81°F | 68°F | 8.6" |
| October | 44°F | 72°F | 57°F | 5.2" |
| November | 33°F | 60°F | 46°F | 5.8" |
| December | 29°F | 50°F | 39°F | 6.8" |
| Index | Monticello | Kentucky | National |
| Air quality index | 40 | 45 | 42 |
| Pollution index | 7,476,200 | 1,369,131 | 2,726,193 |
| Measurement | Total |
| Days measured | 282 |
| Days with good air quality | 267 |
| Days with moderate air quality | 15 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.130% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.010% |
| Mercury | 0.170% |
| City | Population | Air Quality Index | National Avg. |
| Burnside, KY | 979 | 40 | 20.0% |
| Jamestown, KY | 2,242 | 40 | 20.0% |
| Russell Springs, KY | 2,587 | 40 | 20.0% |
| Monticello, KY | 5,999 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Comstock Northwest, MI | 5,999 | 38 | 24.0% |
| Darlington, SC | 6,000 | 40 | 20.0% |
| Chesapeake Beach, MD | 5,996 | 41 | 18.0% |
| District Heights, MD | 5,996 | 47 | 6.0% |
| Snyderville, UT | 5,995 | 51 | 2.0% |
| Monticello, KY | 5,999 | 40 | 20.0% |
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