| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 10°F | 28°F | 19°F | 4.0" |
| February | 10°F | 29°F | 19°F | 3.2" |
| March | 19°F | 38°F | 28°F | 3.5" |
| April | 34°F | 56°F | 44°F | 3.8" |
| May | 46°F | 68°F | 56°F | 4.0" |
| June | 55°F | 75°F | 64°F | 6.0" |
| July | 60°F | 79°F | 69°F | 4.5" |
| August | 57°F | 77°F | 67°F | 4.5" |
| September | 51°F | 72°F | 60°F | 4.3" |
| October | 40°F | 58°F | 48°F | 4.9" |
| November | 29°F | 46°F | 37°F | 3.4" |
| December | 17°F | 32°F | 24°F | 4.5" |
| Index | Swanton | Vermont | National |
| Air quality index | 37 | 36 | 42 |
| Pollution index | 3,508,050 | 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 | 0.004% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.005% |
| Lead | 0.010% |
| Mercury | 0.003% |
| City | Population | Air Quality Index | National Avg. |
| Cumberland Head, NY | 1,495 | 37 | 26.0% |
| Rouses Point, NY | 2,403 | 37 | 26.0% |
| Alburgh, VT | 422 | 37 | 26.0% |
| St. Albans, VT | 6,796 | 37 | 26.0% |
| Swanton, VT | 2,328 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Graysville, AL | 2,328 | 53 | 6.0% |
| Silver Creek, NY | 2,328 | 39 | 22.0% |
| Rio Verde, AZ | 2,327 | 74 | 48.0% |
| Sylvania, GA | 2,327 | 47 | 6.0% |
| Long Valley, NJ | 2,327 | 34 | 32.0% |
| Swanton, VT | 2,328 | 37 | 26.0% |
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