| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 31°F | 21°F | 4.3" |
| February | 11°F | 32°F | 21°F | 3.9" |
| March | 18°F | 41°F | 29°F | 5.3" |
| April | 32°F | 56°F | 44°F | 7.2" |
| May | 41°F | 68°F | 54°F | 4.5" |
| June | 55°F | 79°F | 66°F | 5.1" |
| July | 58°F | 81°F | 69°F | 5.2" |
| August | 56°F | 81°F | 68°F | 2.4" |
| September | 49°F | 76°F | 61°F | 3.2" |
| October | 42°F | 62°F | 51°F | 10.5" |
| November | 27°F | 46°F | 36°F | 7.6" |
| December | 16°F | 33°F | 24°F | 4.4" |
| Index | Newport | New Hampshire | National |
| Air quality index | 34 | 34 | 42 |
| Pollution index | 5,847,470 | 3,959,618 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 328 |
| Days with moderate air quality | 37 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.180% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Bradford, NH | 306 | 27 | 46.0% |
| New London, NH | 1,364 | 34 | 32.0% |
| Claremont, NH | 12,969 | 34 | 32.0% |
| Windsor, VT | 2,042 | 34 | 32.0% |
| Charlestown, NH | 933 | 34 | 32.0% |
| Newport, NH | 5,530 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Germantown, OH | 5,530 | 47 | 6.0% |
| Duquesne, PA | 5,534 | 56 | 12.0% |
| Boothwyn, PA | 5,525 | 51 | 2.0% |
| Swartz Creek, MI | 5,535 | 38 | 24.0% |
| Pelham Manor, NY | 5,535 | 51 | 2.0% |
| Newport, NH | 5,530 | 34 | 32.0% |
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