| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 33°F | 25°F | 4.6" |
| February | 18°F | 34°F | 25°F | 5.3" |
| March | 25°F | 42°F | 33°F | 8.6" |
| April | 37°F | 54°F | 45°F | 11.3" |
| May | 46°F | 63°F | 54°F | 9.8" |
| June | 57°F | 76°F | 66°F | 6.0" |
| July | 62°F | 80°F | 70°F | 6.2" |
| August | 63°F | 81°F | 71°F | 4.7" |
| September | 56°F | 74°F | 65°F | 9.2" |
| October | 47°F | 61°F | 54°F | 15.5" |
| November | 35°F | 49°F | 41°F | 6.8" |
| December | 22°F | 36°F | 28°F | 4.6" |
| Index | Exeter | 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. |
| Dover, NH | 31,922 | 37 | 26.0% |
| Seabrook Beach, NH | 976 | 37 | 26.0% |
| Epping, NH | 3,001 | 37 | 26.0% |
| Newfields, NH | 254 | 37 | 26.0% |
| Newburyport, MA | 18,197 | 37 | 26.0% |
| Exeter, NH | 9,349 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Edwards, CO | 9,347 | 47 | 6.0% |
| Crestline, CA | 9,351 | 89 | 78.0% |
| Carencro, LA | 9,346 | 41 | 18.0% |
| Ladysmith, BC | 9,354 | n/a | |
| Claymont, DE | 9,343 | 51 | 2.0% |
| Exeter, NH | 9,349 | 37 | 26.0% |
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