| 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 | Newmarket | New Hampshire | National |
| Air quality index | 37 | 34 | 42 |
| Pollution index | 91,790 | 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 | 0.000% |
| Benzene | 0.002% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Berwick, ME | 1,985 | 27 | 46.0% |
| Seabrook Beach, NH | 976 | 37 | 26.0% |
| Epping, NH | 3,001 | 37 | 26.0% |
| Newfields, NH | 254 | 37 | 26.0% |
| Dover, NH | 31,922 | 37 | 26.0% |
| Newmarket, NH | 5,737 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| West Side Highway, WA | 5,735 | 18 | 64.0% |
| Schriever, LA | 5,734 | 41 | 18.0% |
| Newtown Grant, PA | 5,740 | 41 | 18.0% |
| Princeton, WV | 5,740 | 295 | 490.0% |
| Nolanville, TX | 5,732 | 42 | 16.0% |
| Newmarket, NH | 5,737 | 37 | 26.0% |
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