| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 7°F | 27°F | 17°F | 4.1" |
| February | 8°F | 29°F | 18°F | 3.8" |
| March | 17°F | 38°F | 27°F | 3.6" |
| April | 31°F | 55°F | 43°F | 3.4" |
| May | 43°F | 68°F | 55°F | 3.8" |
| June | 53°F | 76°F | 63°F | 5.4" |
| July | 57°F | 80°F | 68°F | 4.0" |
| August | 55°F | 78°F | 66°F | 4.8" |
| September | 48°F | 72°F | 59°F | 3.1" |
| October | 38°F | 58°F | 47°F | 4.6" |
| November | 27°F | 46°F | 36°F | 3.1" |
| December | 15°F | 32°F | 23°F | 5.4" |
| Index | Canaan | Vermont | National |
| Air quality index | 40 | 36 | 42 |
| Pollution index | 2,398,170 | 1,478,772 | 2,726,193 |
| Measurement | Total |
| Days measured | 324 |
| Days with good air quality | 314 |
| Days with moderate air quality | 10 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.020% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Colebrook, NH | 1,037 | 40 | 20.0% |
| West Stewartstown, NH | 325 | 40 | 20.0% |
| Beecher Falls, VT | 174 | 40 | 20.0% |
| Canaan, VT | 341 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Midland, AR | 341 | 36 | 28.0% |
| Shirley, AR | 341 | 36 | 28.0% |
| Edmundson Acres, CA | 341 | 67 | 34.0% |
| Mad River, CA | 341 | 27 | 46.0% |
| Richfield, CA | 341 | 41 | 18.0% |
| Canaan, VT | 341 | 40 | 20.0% |
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