| 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 | Epping | New Hampshire | National |
| Air quality index | 37 | 34 | 42 |
| Pollution index | 4,139,320 | 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 | 0.060% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.020% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Hampton Beach, NH | 2,485 | 37 | 26.0% |
| Raymond, NH | 3,807 | 37 | 26.0% |
| Newfields, NH | 254 | 37 | 26.0% |
| Salisbury, MA | 5,116 | 37 | 26.0% |
| Seabrook Beach, NH | 976 | 37 | 26.0% |
| Epping, NH | 3,001 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Yountville, CA | 3,001 | 35 | 30.0% |
| Tonkawa, OK | 3,000 | 40 | 20.0% |
| Fairview CDP (Westchester County), NY | 2,999 | 36 | 28.0% |
| Mendenhall, MS | 3,003 | 44 | 12.0% |
| Shark River Hills, NJ | 3,003 | 51 | 2.0% |
| Epping, NH | 3,001 | 37 | 26.0% |
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