| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 4°F | 21°F | 12°F | 3.4" |
| February | 7°F | 25°F | 15°F | 14.0" |
| March | 15°F | 34°F | 24°F | 6.3" |
| April | 30°F | 47°F | 38°F | 10.5" |
| May | 41°F | 60°F | 49°F | 6.3" |
| June | 53°F | 74°F | 62°F | 4.5" |
| July | 57°F | 76°F | 65°F | 6.6" |
| August | 55°F | 75°F | 64°F | 9.1" |
| September | 50°F | 69°F | 58°F | 7.2" |
| October | 41°F | 56°F | 47°F | 12.4" |
| November | 26°F | 39°F | 32°F | 10.1" |
| December | 13°F | 26°F | 19°F | 8.1" |
| Index | Greenville | Maine | National |
| Air quality index | 31 | 33 | 42 |
| Pollution index | 3,063,530 | 3,417,521 | 2,726,193 |
| Measurement | Total |
| Days measured | 361 |
| Days with good air quality | 348 |
| Days with moderate air quality | 13 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.004% |
| City | Population | Air Quality Index | National Avg. |
| Greenville, ME | 1,364 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| Magnolia, NC | 1,364 | 40 | 20.0% |
| Natalia, TX | 1,364 | 49 | 2.0% |
| New Summerfield, TX | 1,364 | 36 | 28.0% |
| Pointe-à-la-Croix, QC | 1,364 | n/a | |
| Nantes, QC | 1,364 | n/a | |
| Greenville, ME | 1,364 | 31 | 38.0% |
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