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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 15°F | 36°F | 25°F | 3.2" |
| February | 15°F | 37°F | 26°F | 4.2" |
| March | 24°F | 44°F | 34°F | 4.0" |
| April | 34°F | 57°F | 45°F | 5.0" |
| May | 44°F | 67°F | 55°F | 4.5" |
| June | 53°F | 75°F | 63°F | 5.8" |
| July | 60°F | 82°F | 70°F | 4.3" |
| August | 58°F | 80°F | 69°F | 4.4" |
| September | 51°F | 74°F | 62°F | 4.1" |
| October | 41°F | 62°F | 51°F | 6.9" |
| November | 31°F | 52°F | 41°F | 4.4" |
| December | 21°F | 40°F | 30°F | 5.3" |
| Index | North Windham | Maine | National |
| Air quality index | 40 | 33 | 42 |
| Pollution index | 2,712,920 | 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 | 0.030% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.050% |
| Mercury | 0.070% |
| City | Population | Air Quality Index | National Avg. |
| Casco, ME | 717 | 31 | 38.0% |
| Naples, ME | 555 | 31 | 38.0% |
| Gray, ME | 747 | 31 | 38.0% |
| Little Falls, ME | 745 | 40 | 20.0% |
| Cumberland Center, ME | 2,944 | 40 | 20.0% |
| North Windham, ME | 5,651 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Columbia Falls, MT | 5,651 | 37 | 26.0% |
| Clarion, PA | 5,650 | 33 | 34.0% |
| Covington, VA | 5,653 | 38 | 24.0% |
| Oliver, BC | 5,648 | n/a | |
| Didsbury, AB | 5,654 | n/a | |
| North Windham, ME | 5,651 | 40 | 20.0% |
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