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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 26°F | 41°F | 33°F | 4.6" |
| February | 24°F | 39°F | 31°F | 3.2" |
| March | 30°F | 47°F | 38°F | 6.5" |
| April | 41°F | 59°F | 49°F | 10.8" |
| May | 50°F | 68°F | 58°F | 3.5" |
| June | 62°F | 78°F | 69°F | 6.0" |
| July | 67°F | 82°F | 74°F | 8.7" |
| August | 67°F | 83°F | 75°F | 6.0" |
| September | 61°F | 79°F | 69°F | 4.2" |
| October | 52°F | 68°F | 59°F | 16.3" |
| November | 39°F | 55°F | 47°F | 5.8" |
| December | 30°F | 43°F | 36°F | 5.8" |
| Index | Massapequa | New York | National |
| Air quality index | 51 | 43 | 42 |
| Pollution index | 39,208,800 | 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 | 0.060% |
| Benzene | 0.320% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.320% |
| Mercury | 0.130% |
| City | Population | Air Quality Index | National Avg. |
| Smithtown, NY | 26,197 | 43 | 14.0% |
| Brentwood, NY | 62,743 | 43 | 14.0% |
| East Northport, NY | 20,085 | 43 | 14.0% |
| Huntington Station, NY | 33,612 | 43 | 14.0% |
| Bay Shore, NY | 31,819 | 43 | 14.0% |
| Massapequa, NY | 21,531 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Kapolei, HI | 21,541 | 30 | 40.0% |
| Darien, CT | 21,519 | 43 | 14.0% |
| Anniston, AL | 21,518 | 38 | 24.0% |
| Klamath Falls, OR | 21,509 | 29 | 42.0% |
| Biddeford, ME | 21,502 | 40 | 20.0% |
| Massapequa, NY | 21,531 | 51 | 2.0% |
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