| 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 | Hornell | New York | National |
| Air quality index | 35 | 43 | 42 |
| Pollution index | 2,885,140 | 6,179,275 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 349 |
| Days with moderate air quality | 16 |
| 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. |
| Andover, NY | 856 | 35 | 30.0% |
| Canisteo, NY | 2,330 | 35 | 30.0% |
| Canaseraga, NY | 487 | 35 | 30.0% |
| Arkport, NY | 1,076 | 35 | 30.0% |
| Almond, NY | 446 | 35 | 30.0% |
| Hornell, NY | 8,274 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Fort Mitchell, KY | 8,278 | 54 | 8.0% |
| Oak Grove, MO | 8,278 | 47 | 6.0% |
| Four Corners, MD | 8,268 | 47 | 6.0% |
| Lac la Biche County, AB | 8,268 | n/a | |
| Orting, WA | 8,267 | 30 | 40.0% |
| Hornell, NY | 8,274 | 35 | 30.0% |
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