| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 40°F | 32°F | 3.4" |
| February | 25°F | 40°F | 32°F | 3.7" |
| March | 31°F | 48°F | 39°F | 4.8" |
| April | 41°F | 60°F | 50°F | 5.6" |
| May | 50°F | 68°F | 58°F | 3.9" |
| June | 61°F | 78°F | 69°F | 4.3" |
| July | 67°F | 83°F | 74°F | 5.4" |
| August | 66°F | 82°F | 74°F | 3.1" |
| September | 59°F | 76°F | 67°F | 4.1" |
| October | 48°F | 65°F | 56°F | 6.9" |
| November | 39°F | 55°F | 47°F | 4.0" |
| December | 30°F | 44°F | 37°F | 6.2" |
| Index | Blue Point | 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. |
| Calverton, NY | 5,280 | 41 | 18.0% |
| Nesconset, NY | 13,440 | 43 | 14.0% |
| Port Jefferson, NY | 8,016 | 43 | 14.0% |
| Setauket-East Setauket, NY | 14,174 | 43 | 14.0% |
| Terryville, NY | 11,437 | 43 | 14.0% |
| Blue Point, NY | 4,739 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Westmont, PA | 4,739 | 39 | 22.0% |
| Dundee, FL | 4,738 | 36 | 28.0% |
| Morganville, NJ | 4,738 | 41 | 18.0% |
| Berlin, MD | 4,740 | 36 | 28.0% |
| Brookdale, SC | 4,740 | 43 | 14.0% |
| Blue Point, NY | 4,739 | 43 | 14.0% |
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