| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 36°F | 27°F | 1.5" |
| February | 18°F | 36°F | 27°F | 1.2" |
| March | 26°F | 47°F | 35°F | 1.8" |
| April | 37°F | 62°F | 48°F | 2.4" |
| May | 47°F | 73°F | 60°F | 2.9" |
| June | 57°F | 81°F | 68°F | 3.5" |
| July | 61°F | 84°F | 72°F | 4.0" |
| August | 59°F | 82°F | 70°F | 3.9" |
| September | 53°F | 76°F | 64°F | 2.6" |
| October | 43°F | 64°F | 53°F | 3.7" |
| November | 33°F | 53°F | 42°F | 2.0" |
| December | 25°F | 41°F | 33°F | 2.0" |
| Index | Hemlock | New York | National |
| Air quality index | 37 | 43 | 42 |
| Pollution index | 2,885,140 | 6,179,275 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 317 |
| Days with moderate air quality | 48 |
| 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. |
| Naples, NY | 906 | 35 | 30.0% |
| Livonia, NY | 1,472 | 37 | 26.0% |
| Websters Crossing, NY | 81 | 37 | 26.0% |
| Tuscarora, NY | 82 | 37 | 26.0% |
| Cuylerville, NY | 275 | 37 | 26.0% |
| Hemlock, NY | 550 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Eek, AK | 550 | 31 | 38.0% |
| New Cuyama, CA | 550 | 44 | 12.0% |
| San Simeon, CA | 550 | 46 | 8.0% |
| Camargo, IL | 550 | 42 | 16.0% |
| Thebes, IL | 550 | 44 | 12.0% |
| Hemlock, NY | 550 | 37 | 26.0% |
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