| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 32°F | 22°F | 3.2" |
| February | 11°F | 34°F | 22°F | 3.6" |
| March | 18°F | 40°F | 29°F | 3.4" |
| April | 33°F | 58°F | 45°F | 3.2" |
| May | 45°F | 72°F | 58°F | 5.3" |
| June | 54°F | 78°F | 66°F | 6.6" |
| July | 59°F | 82°F | 70°F | 6.2" |
| August | 57°F | 81°F | 68°F | 4.3" |
| September | 50°F | 76°F | 62°F | 4.8" |
| October | 41°F | 63°F | 52°F | 5.0" |
| November | 29°F | 49°F | 39°F | 2.7" |
| December | 21°F | 37°F | 29°F | 3.4" |
| Index | Vergennes | Vermont | National |
| Air quality index | 37 | 36 | 42 |
| Pollution index | 3,716,800 | 1,478,772 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 335 |
| Days with moderate air quality | 30 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.030% |
| Mercury | 0.004% |
| City | Population | Air Quality Index | National Avg. |
| East Middlebury, VT | 381 | 36 | 28.0% |
| Middlebury, VT | 6,929 | 36 | 28.0% |
| Mineville, NY | 1,227 | 37 | 26.0% |
| Willsboro, NY | 605 | 37 | 26.0% |
| Port Henry, NY | 1,859 | 37 | 26.0% |
| Vergennes, VT | 2,607 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Summerset, SD | 2,607 | 44 | 12.0% |
| Williams Bay, WI | 2,607 | 37 | 26.0% |
| South Oroville, CA | 2,606 | 46 | 8.0% |
| Lincoln, ME | 2,606 | 31 | 38.0% |
| Saint-Gabriel-de-Brandon, QC | 2,606 | n/a | |
| Vergennes, VT | 2,607 | 37 | 26.0% |
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