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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 34°F | 27°F | 4.7" |
| February | 16°F | 36°F | 27°F | 0.9" |
| March | 25°F | 45°F | 36°F | 3.8" |
| April | 38°F | 59°F | 49°F | 9.3" |
| May | 47°F | 68°F | 58°F | 5.4" |
| June | 60°F | 81°F | 71°F | 0.9" |
| July | 64°F | 84°F | 74°F | 3.9" |
| August | 62°F | 85°F | 75°F | 0.0" |
| September | 53°F | 78°F | 67°F | 0.0" |
| October | 46°F | 65°F | 55°F | 5.7" |
| November | 31°F | 50°F | 40°F | 6.4" |
| December | 19°F | 36°F | 27°F | 3.4" |
| Index | Wilton | New Hampshire | National |
| Air quality index | 37 | 34 | 42 |
| Pollution index | 6,602,810 | 3,959,618 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 353 |
| Days with moderate air quality | 12 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.060% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Bennington, NH | 265 | 34 | 32.0% |
| Hancock, NH | 231 | 34 | 32.0% |
| Jaffrey, NH | 2,750 | 34 | 32.0% |
| Antrim, NH | 1,364 | 34 | 32.0% |
| Peterborough, NH | 2,704 | 34 | 32.0% |
| Wilton, NH | 1,203 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Greenville, ME | 1,203 | 31 | 38.0% |
| Quinnesec, MI | 1,203 | 36 | 28.0% |
| Edmundson, MO | 1,203 | 54 | 8.0% |
| Elbridge, NY | 1,203 | 37 | 26.0% |
| Gore, OK | 1,203 | 5 | 90.0% |
| Wilton, NH | 1,203 | 37 | 26.0% |
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