| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 17°F | 32°F | 24°F | 4.9" |
| February | 17°F | 33°F | 25°F | 4.4" |
| March | 26°F | 45°F | 34°F | 5.3" |
| April | 36°F | 58°F | 46°F | 6.9" |
| May | 47°F | 69°F | 57°F | 5.6" |
| June | 55°F | 76°F | 65°F | 9.2" |
| July | 60°F | 81°F | 70°F | 8.2" |
| August | 57°F | 78°F | 67°F | 8.7" |
| September | 52°F | 72°F | 61°F | 7.4" |
| October | 42°F | 60°F | 50°F | 6.6" |
| November | 31°F | 48°F | 39°F | 4.7" |
| December | 24°F | 37°F | 30°F | 6.3" |
| Index | Monticello | New York | National |
| Air quality index | 36 | 43 | 42 |
| Pollution index | 9,612,350 | 6,179,275 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 319 |
| Days with moderate air quality | 46 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.030% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.230% |
| Mercury | 0.080% |
| City | Population | Air Quality Index | National Avg. |
| Rock Hill, NY | 2,204 | 36 | 28.0% |
| Wurtsboro, NY | 1,014 | 36 | 28.0% |
| Bloomingburg, NY | 528 | 36 | 28.0% |
| Smallwood, NY | 619 | 36 | 28.0% |
| Middletown, NY | 28,018 | 36 | 28.0% |
| Monticello, NY | 6,429 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Brattleboro, VT | 6,429 | 34 | 32.0% |
| La Broquerie, MB | 6,430 | n/a | |
| Kasson, MN | 6,425 | 36 | 28.0% |
| Ishpeming, MI | 6,433 | 8 | 84.0% |
| Oliver Paipoonge, ON | 6,433 | n/a | |
| Monticello, NY | 6,429 | 36 | 28.0% |
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