| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 31°F | 22°F | 2.0" |
| February | 13°F | 33°F | 23°F | 2.4" |
| March | 21°F | 42°F | 31°F | 2.1" |
| April | 34°F | 59°F | 46°F | 3.8" |
| May | 46°F | 72°F | 58°F | 4.4" |
| June | 56°F | 79°F | 67°F | 5.5" |
| July | 60°F | 84°F | 72°F | 4.7" |
| August | 59°F | 82°F | 70°F | 3.4" |
| September | 52°F | 75°F | 63°F | 3.9" |
| October | 41°F | 62°F | 51°F | 4.9" |
| November | 31°F | 49°F | 40°F | 2.6" |
| December | 20°F | 37°F | 28°F | 3.3" |
| Index | Fairfax | Vermont | National |
| Air quality index | 37 | 36 | 42 |
| Pollution index | 1,278,430 | 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 | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Burlington, VT | 42,645 | 37 | 26.0% |
| Cambridge, VT | 244 | 37 | 26.0% |
| St. Albans, VT | 6,796 | 37 | 26.0% |
| Essex Junction, VT | 10,761 | 37 | 26.0% |
| Jeffersonville, VT | 667 | 37 | 26.0% |
| Fairfax, VT | 1,145 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Crowley Lake, CA | 1,145 | 47 | 6.0% |
| Pierceton, IN | 1,145 | 31 | 38.0% |
| Valley Falls, KS | 1,145 | 41 | 18.0% |
| Little Valley, NY | 1,145 | 37 | 26.0% |
| Fairfield Beach, OH | 1,145 | 46 | 8.0% |
| Fairfax, VT | 1,145 | 37 | 26.0% |
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