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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 14°F | 32°F | 23°F | 2.9" |
| February | 14°F | 34°F | 24°F | 3.3" |
| March | 22°F | 43°F | 32°F | 3.7" |
| April | 34°F | 57°F | 45°F | 3.3" |
| May | 45°F | 69°F | 56°F | 3.8" |
| June | 54°F | 76°F | 64°F | 4.9" |
| July | 59°F | 81°F | 70°F | 4.3" |
| August | 56°F | 79°F | 67°F | 4.4" |
| September | 50°F | 73°F | 61°F | 3.9" |
| October | 40°F | 61°F | 49°F | 5.5" |
| November | 30°F | 49°F | 38°F | 2.9" |
| December | 21°F | 38°F | 29°F | 4.0" |
| Index | Antrim | New Hampshire | National |
| Air quality index | 34 | 34 | 42 |
| Pollution index | 6,602,810 | 3,959,618 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 348 |
| Days with moderate air quality | 17 |
| 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. |
| Hillsborough, NH | 1,421 | 27 | 46.0% |
| Warner, NH | 638 | 27 | 46.0% |
| Henniker, NH | 2,566 | 27 | 46.0% |
| Contoocook, NH | 1,353 | 27 | 46.0% |
| Marlborough, NH | 1,093 | 34 | 32.0% |
| Antrim, NH | 1,364 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Parshall, ND | 1,364 | 34 | 32.0% |
| Wisner, NE | 1,364 | 35 | 30.0% |
| New London, NH | 1,364 | 34 | 32.0% |
| Francis, UT | 1,364 | 46 | 8.0% |
| Pointe-à-la-Croix, QC | 1,364 | n/a | |
| Antrim, NH | 1,364 | 34 | 32.0% |
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