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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 36°F | 26°F | 2.5" |
| February | 18°F | 38°F | 27°F | 3.0" |
| March | 27°F | 46°F | 36°F | 3.6" |
| April | 38°F | 61°F | 49°F | 3.3" |
| May | 48°F | 71°F | 59°F | 3.9" |
| June | 58°F | 79°F | 68°F | 4.6" |
| July | 64°F | 85°F | 74°F | 3.8" |
| August | 61°F | 83°F | 72°F | 4.3" |
| September | 55°F | 76°F | 65°F | 3.9" |
| October | 44°F | 64°F | 53°F | 5.4" |
| November | 33°F | 52°F | 42°F | 3.1" |
| December | 24°F | 40°F | 31°F | 3.6" |
| Index | Goffstown | 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. |
| Henniker, NH | 2,566 | 27 | 46.0% |
| Suncook, NH | 4,975 | 27 | 46.0% |
| Concord, NH | 43,503 | 27 | 46.0% |
| Contoocook, NH | 1,353 | 27 | 46.0% |
| Milford, NH | 8,644 | 37 | 26.0% |
| Goffstown, NH | 2,848 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Kechi, KS | 2,848 | 40 | 20.0% |
| Riverview, MO | 2,848 | 54 | 8.0% |
| Salado, TX | 2,848 | 42 | 16.0% |
| Natalbany, LA | 2,847 | 30 | 40.0% |
| Horace, ND | 2,847 | 33 | 34.0% |
| Goffstown, NH | 2,848 | 37 | 26.0% |
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