| 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. |
| Blue Point, NY | 4,739 | 43 | 14.0% |
| Dix Hills, NY | 23,995 | 43 | 14.0% |
| North Patchogue, NY | 8,202 | 43 | 14.0% |
| Brookhaven, NY | 3,203 | 43 | 14.0% |
| Mastic, NY | 15,068 | 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% |
Here are the best places to live in New York
Top 10 cities in New York with the best education system
Check out the 10 safest cities in New York
Top 10 best public schools in Centereach