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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 41°F | 33°F | 2.7" |
| February | 25°F | 42°F | 33°F | 2.3" |
| March | 32°F | 50°F | 40°F | 3.3" |
| April | 42°F | 60°F | 51°F | 3.7" |
| May | 52°F | 70°F | 60°F | 3.4" |
| June | 61°F | 78°F | 69°F | 4.3" |
| July | 68°F | 84°F | 76°F | 3.2" |
| August | 66°F | 83°F | 74°F | 3.4" |
| September | 60°F | 76°F | 68°F | 3.2" |
| October | 50°F | 66°F | 57°F | 3.5" |
| November | 39°F | 55°F | 47°F | 2.5" |
| December | 32°F | 46°F | 39°F | 4.5" |
| Index | Plainview | 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. |
| Bay Shore, NY | 31,819 | 43 | 14.0% |
| East Islip, NY | 12,722 | 43 | 14.0% |
| North Bay Shore, NY | 19,728 | 43 | 14.0% |
| West Islip, NY | 26,614 | 43 | 14.0% |
| Nissequogue, NY | 1,599 | 43 | 14.0% |
| Plainview, NY | 26,267 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Superior, WI | 26,260 | 35 | 30.0% |
| Orchards, WA | 26,289 | 38 | 24.0% |
| Galt, CA | 26,235 | 45 | 10.0% |
| Clarksburg, MD | 26,234 | 47 | 6.0% |
| Smithtown, NY | 26,197 | 43 | 14.0% |
| Plainview, NY | 26,267 | 51 | 2.0% |
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