| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 21°F | 35°F | 28°F | 1.6" |
| February | 22°F | 38°F | 29°F | 1.0" |
| March | 30°F | 48°F | 38°F | 1.3" |
| April | 41°F | 63°F | 51°F | 4.8" |
| May | 52°F | 72°F | 61°F | 5.5" |
| June | 60°F | 79°F | 68°F | 2.9" |
| July | 65°F | 84°F | 73°F | 0.1" |
| August | 63°F | 81°F | 71°F | 1.8" |
| September | 58°F | 76°F | 65°F | 0.1" |
| October | 46°F | 62°F | 53°F | 2.3" |
| November | 36°F | 52°F | 43°F | 1.8" |
| December | 28°F | 40°F | 33°F | 1.7" |
| Index | Hillside | New York | National |
| Air quality index | 36 | 43 | 42 |
| Pollution index | 4,483,560 | 6,179,275 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 319 |
| Days with moderate air quality | 46 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.005% |
| Lead | 0.020% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Phoenicia, NY | 353 | 36 | 28.0% |
| Hurley, NY | 3,529 | 36 | 28.0% |
| Port Ewen, NY | 3,334 | 36 | 28.0% |
| Shokan, NY | 1,355 | 36 | 28.0% |
| Haviland, NY | 3,148 | 36 | 28.0% |
| Hillside, NY | 742 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Kirkwood, IL | 742 | 29 | 42.0% |
| New Haven, KY | 742 | 39 | 22.0% |
| Greenwood, MN | 742 | 46 | 8.0% |
| East Alto Bonito, TX | 742 | 42 | 16.0% |
| Grand Coulee, SK | 742 | n/a | |
| Hillside, NY | 742 | 36 | 28.0% |
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