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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 41°F | 32°F | 4.0" |
| February | 24°F | 43°F | 33°F | 3.0" |
| March | 31°F | 50°F | 40°F | 4.2" |
| April | 41°F | 61°F | 50°F | 3.5" |
| May | 51°F | 71°F | 60°F | 3.6" |
| June | 60°F | 79°F | 69°F | 4.7" |
| July | 68°F | 85°F | 76°F | 3.1" |
| August | 65°F | 83°F | 74°F | 5.6" |
| September | 60°F | 78°F | 68°F | 3.1" |
| October | 49°F | 67°F | 58°F | 4.1" |
| November | 37°F | 56°F | 46°F | 3.0" |
| December | 31°F | 47°F | 39°F | 4.9" |
| Index | Centereach | New York | National |
| Air quality index | 43 | 43 | 42 |
| Pollution index | 39,208,800 | 6,179,275 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 262 |
| Days with moderate air quality | 82 |
| Days w/ poor A.Q. for sensitive groups | 18 |
| Days with unhealthy air quality | 3 |
| 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. |
| Commack, NY | 36,903 | 43 | 14.0% |
| Greenlawn, NY | 14,598 | 43 | 14.0% |
| Bay Shore, NY | 31,819 | 43 | 14.0% |
| East Islip, NY | 12,722 | 43 | 14.0% |
| Belle Terre, NY | 791 | 43 | 14.0% |
| Centereach, NY | 31,100 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Saratoga, CA | 31,084 | 43 | 14.0% |
| Lakeside, FL | 31,058 | 43 | 14.0% |
| Hopkinsville, KY | 31,052 | 40 | 20.0% |
| Princeton, NJ | 31,161 | 41 | 18.0% |
| Needham, MA | 31,177 | 43 | 14.0% |
| Centereach, NY | 31,100 | 43 | 14.0% |
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