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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 36°F | 27°F | 5.3" |
| February | 19°F | 37°F | 27°F | 6.2" |
| March | 27°F | 45°F | 35°F | 7.3" |
| April | 37°F | 58°F | 47°F | 7.5" |
| May | 47°F | 68°F | 57°F | 7.1" |
| June | 56°F | 76°F | 65°F | 8.3" |
| July | 63°F | 83°F | 72°F | 7.9" |
| August | 60°F | 81°F | 70°F | 8.4" |
| September | 54°F | 74°F | 63°F | 8.5" |
| October | 43°F | 63°F | 52°F | 8.2" |
| November | 33°F | 52°F | 42°F | 6.9" |
| December | 24°F | 41°F | 32°F | 6.3" |
| Index | Epping | New Hampshire | National |
| Air quality index | 37 | 34 | 42 |
| Pollution index | 4,139,320 | 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 | 0.060% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.020% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Salisbury, MA | 5,226 | 37 | 26.0% |
| Seabrook Beach, NH | 1,000 | 37 | 26.0% |
| Amesbury Town, MA | 17,916 | 37 | 26.0% |
| Newmarket, NH | 5,955 | 37 | 26.0% |
| Dover, NH | 33,095 | 37 | 26.0% |
| Epping, NH | 3,108 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Platteville, CO | 3,108 | 45 | 10.0% |
| West Brattleboro, VT | 3,108 | 34 | 32.0% |
| Greenfield, MN | 3,107 | 46 | 8.0% |
| Troy, TX | 3,109 | 38 | 24.0% |
| Andrews, SC | 3,106 | 14 | 72.0% |
| Epping, NH | 3,108 | 37 | 26.0% |
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