| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 27°F | 43°F | 34°F | 3.5" |
| February | 27°F | 44°F | 35°F | 2.9" |
| March | 34°F | 53°F | 42°F | 3.8" |
| April | 45°F | 65°F | 53°F | 4.4" |
| May | 54°F | 74°F | 63°F | 4.2" |
| June | 64°F | 83°F | 73°F | 4.9" |
| July | 71°F | 89°F | 79°F | 4.3" |
| August | 70°F | 86°F | 77°F | 5.0" |
| September | 64°F | 80°F | 71°F | 3.3" |
| October | 53°F | 69°F | 60°F | 5.1" |
| November | 42°F | 58°F | 49°F | 3.2" |
| December | 34°F | 48°F | 40°F | 4.9" |
| Index | Roslyn Harbor | New York | National |
| Air quality index | 51 | 43 | 42 |
| Pollution index | 22,367,000 | 6,179,275 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 169 |
| Days with moderate air quality | 180 |
| Days w/ poor A.Q. for sensitive groups | 16 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.040% |
| Benzene | 0.180% |
| Carbon Tetrachloride | 0.070% |
| Lead | 0.050% |
| Mercury | 0.050% |
| City | Population | Air Quality Index | National Avg. |
| Asharoken, NY | 586 | 43 | 14.0% |
| Halesite, NY | 2,483 | 43 | 14.0% |
| Lloyd Harbor, NY | 3,663 | 43 | 14.0% |
| Centerport, NY | 5,773 | 43 | 14.0% |
| Huntington, NY | 19,438 | 43 | 14.0% |
| Roslyn Harbor, NY | 1,014 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Dubach, LA | 1,014 | 35 | 30.0% |
| Wurtsboro, NY | 1,014 | 36 | 28.0% |
| Milford Center, OH | 1,014 | 45 | 10.0% |
| Midway, PA | 1,014 | 42 | 16.0% |
| Speers, PA | 1,014 | 56 | 12.0% |
| Roslyn Harbor, NY | 1,014 | 51 | 2.0% |
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