| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 15°F | 32°F | 23°F | 4.4" |
| February | 12°F | 33°F | 22°F | 4.1" |
| March | 18°F | 41°F | 30°F | 5.1" |
| April | 33°F | 55°F | 44°F | 12.8" |
| May | 43°F | 66°F | 54°F | 6.8" |
| June | 55°F | 78°F | 66°F | 4.6" |
| July | 59°F | 80°F | 69°F | 5.1" |
| August | 58°F | 80°F | 69°F | 3.2" |
| September | 51°F | 75°F | 62°F | 3.5" |
| October | 43°F | 61°F | 52°F | 7.2" |
| November | 28°F | 47°F | 37°F | 6.3" |
| December | 16°F | 33°F | 25°F | 5.9" |
| Index | Greenville | New Hampshire | National |
| Air quality index | 37 | 34 | 42 |
| Pollution index | 6,602,810 | 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 | 0.070% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.060% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Baldwinville, MA | 2,137 | 34 | 32.0% |
| Hancock, NH | 231 | 34 | 32.0% |
| Winchendon, MA | 4,673 | 34 | 32.0% |
| Jaffrey, NH | 2,750 | 34 | 32.0% |
| Peterborough, NH | 2,704 | 34 | 32.0% |
| Greenville, NH | 1,011 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Mountain Mesa, CA | 1,011 | 67 | 34.0% |
| George, IA | 1,011 | 36 | 28.0% |
| Enderlin, ND | 1,011 | 33 | 34.0% |
| Weeping Water, NE | 1,011 | 40 | 20.0% |
| Baileyton, AL | 1,012 | 44 | 12.0% |
| Greenville, NH | 1,011 | 37 | 26.0% |
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