| 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 | Smithtown | 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. |
| Bellport, NY | 1,899 | 43 | 14.0% |
| Central Islip, NY | 33,591 | 43 | 14.0% |
| North Bellport, NY | 10,468 | 43 | 14.0% |
| Sayville, NY | 15,910 | 43 | 14.0% |
| Sound Beach, NY | 7,080 | 43 | 14.0% |
| Smithtown, NY | 26,197 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Troy, OH | 26,176 | 47 | 6.0% |
| Clarksburg, MD | 26,234 | 47 | 6.0% |
| Galt, CA | 26,235 | 45 | 10.0% |
| Belmont, MA | 26,158 | 43 | 14.0% |
| University Park, FL | 26,150 | 41 | 18.0% |
| Smithtown, NY | 26,197 | 43 | 14.0% |
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