| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 17°F | 36°F | 26°F | 3.3" |
| February | 17°F | 38°F | 27°F | 4.5" |
| March | 26°F | 47°F | 36°F | 4.7" |
| April | 37°F | 61°F | 49°F | 5.9" |
| May | 47°F | 72°F | 59°F | 5.1" |
| June | 56°F | 79°F | 67°F | 5.9" |
| July | 63°F | 86°F | 74°F | 5.0" |
| August | 60°F | 83°F | 71°F | 5.5" |
| September | 53°F | 76°F | 64°F | 5.7" |
| October | 42°F | 64°F | 52°F | 6.8" |
| November | 31°F | 52°F | 41°F | 5.5" |
| December | 23°F | 41°F | 31°F | 4.8" |
| Index | East Pepperell | Massachusetts | National |
| Air quality index | 37 | 40 | 42 |
| Pollution index | 7,556,320 | 8,399,610 | 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 | 0.040% |
| Lead | 0.010% |
| Mercury | 0.040% |
| City | Population | Air Quality Index | National Avg. |
| Amherst, NH | 656 | 37 | 26.0% |
| Nashua, NH | 89,052 | 37 | 26.0% |
| Groton, MA | 1,127 | 37 | 26.0% |
| Pepperell, MA | 2,685 | 37 | 26.0% |
| Greenville, NH | 1,011 | 37 | 26.0% |
| East Pepperell, MA | 1,916 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Timnath, CO | 1,916 | 48 | 4.0% |
| Skyline Acres, OH | 1,916 | 54 | 8.0% |
| Wedgefield, SC | 1,916 | 43 | 14.0% |
| Rehobeth, AL | 1,917 | 35 | 30.0% |
| Temelec, CA | 1,915 | 35 | 30.0% |
| East Pepperell, MA | 1,916 | 37 | 26.0% |
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