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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 13°F | 34°F | 24°F | 4.8" |
| February | 13°F | 35°F | 24°F | 4.8" |
| March | 22°F | 44°F | 33°F | 7.6" |
| April | 33°F | 57°F | 45°F | 8.0" |
| May | 44°F | 68°F | 55°F | 5.9" |
| June | 53°F | 75°F | 64°F | 7.2" |
| July | 59°F | 82°F | 70°F | 8.1" |
| August | 56°F | 80°F | 68°F | 9.0" |
| September | 49°F | 73°F | 61°F | 7.1" |
| October | 39°F | 62°F | 50°F | 9.4" |
| November | 29°F | 50°F | 39°F | 5.8" |
| December | 19°F | 38°F | 29°F | 5.4" |
| Index | Sanford | Maine | National |
| Air quality index | 40 | 33 | 42 |
| Pollution index | 91,790 | 3,417,521 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 308 |
| Days with moderate air quality | 56 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| 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. |
| Rochester, NH | 31,305 | 27 | 46.0% |
| Berwick, ME | 1,985 | 27 | 46.0% |
| Farmington, NH | 4,140 | 31 | 38.0% |
| Sanbornville, NH | 778 | 31 | 38.0% |
| Milton, NH | 537 | 31 | 38.0% |
| Sanford, ME | 21,166 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Sapulpa, OK | 21,170 | 45 | 10.0% |
| Piqua, OH | 21,159 | 47 | 6.0% |
| Sun Valley, NV | 21,179 | 46 | 8.0% |
| Easley, SC | 21,149 | 46 | 8.0% |
| East Ridge, TN | 21,187 | 46 | 8.0% |
| Sanford, ME | 21,166 | 40 | 20.0% |
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