| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 16°F | 35°F | 26°F | 1.7" |
| February | 16°F | 37°F | 26°F | 1.5" |
| March | 24°F | 47°F | 35°F | 2.3" |
| April | 34°F | 61°F | 47°F | 2.9" |
| May | 44°F | 72°F | 58°F | 2.9" |
| June | 54°F | 80°F | 67°F | 4.0" |
| July | 58°F | 84°F | 71°F | 3.2" |
| August | 56°F | 82°F | 68°F | 4.3" |
| September | 49°F | 75°F | 62°F | 3.3" |
| October | 40°F | 63°F | 51°F | 3.9" |
| November | 29°F | 51°F | 40°F | 2.0" |
| December | 23°F | 40°F | 31°F | 2.2" |
| Index | Erin | New York | National |
| Air quality index | 36 | 43 | 42 |
| Pollution index | 2,885,140 | 6,179,275 | 2,726,193 |
| Measurement | Total |
| Days measured | 352 |
| Days with good air quality | 314 |
| Days with moderate air quality | 38 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.004% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.005% |
| Lead | 0.010% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Odessa, NY | 542 | 34 | 32.0% |
| Newfield Hamlet, NY | 759 | 34 | 32.0% |
| Horseheads North, NY | 2,569 | 35 | 30.0% |
| Southport, NY | 6,821 | 35 | 30.0% |
| Millerton, PA | 406 | 35 | 30.0% |
| Erin, NY | 441 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Norman, AR | 441 | 38 | 24.0% |
| French Gulch, CA | 441 | 42 | 16.0% |
| Sierra Brooks, CA | 441 | 44 | 12.0% |
| Callender, IA | 441 | 37 | 26.0% |
| Farragut, IA | 441 | 40 | 20.0% |
| Erin, NY | 441 | 36 | 28.0% |
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