| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 37°F | 29°F | 8.1" |
| February | 18°F | 34°F | 26°F | 4.1" |
| March | 32°F | 52°F | 41°F | 5.7" |
| April | 40°F | 64°F | 51°F | 7.1" |
| May | 51°F | 75°F | 63°F | 2.9" |
| June | 62°F | 84°F | 73°F | 4.0" |
| July | 61°F | 84°F | 72°F | 4.9" |
| August | 64°F | 85°F | 74°F | 8.8" |
| September | 57°F | 81°F | 68°F | 4.3" |
| October | 49°F | 68°F | 58°F | 5.4" |
| November | 34°F | 53°F | 43°F | 6.2" |
| December | 22°F | 36°F | 29°F | 5.0" |
| Index | Greens Fork | Indiana | National |
| Air quality index | 6 | 56 | 42 |
| Pollution index | 1,974,040 | 2,719,453 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 364 |
| Days with moderate air quality | |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Fountain City, IN | 702 | 6 | 88.0% |
| Richmond, IN | 35,467 | 6 | 88.0% |
| New Paris, OH | 1,418 | 6 | 88.0% |
| Boston, IN | 160 | 6 | 88.0% |
| Spring Grove, IN | 435 | 6 | 88.0% |
| Greens Fork, IN | 519 | 6 | 88.0% |
| City | Population | Air Quality Index | National Avg. |
| Flagler, CO | 519 | 45 | 10.0% |
| Sea Ranch Lakes, FL | 519 | 41 | 18.0% |
| Lamont, IA | 519 | 39 | 22.0% |
| Elnora, IN | 519 | 1 | 98.0% |
| Fairlee, MD | 519 | 46 | 8.0% |
| Greens Fork, IN | 519 | 6 | 88.0% |
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