| 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% |
Here are the best places to live in New York
These are the 10 cheapest cities in New York
Most Dangerous Cities In The US
Check out the 10 most dangerous cities in New York