| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 41°F | 33°F | 3.0" |
| February | 24°F | 41°F | 33°F | 3.2" |
| March | 31°F | 49°F | 40°F | 4.2" |
| April | 40°F | 60°F | 50°F | 4.0" |
| May | 50°F | 69°F | 59°F | 3.8" |
| June | 59°F | 78°F | 68°F | 4.2" |
| July | 66°F | 83°F | 75°F | 3.8" |
| August | 64°F | 82°F | 73°F | 3.2" |
| September | 58°F | 76°F | 67°F | 3.7" |
| October | 48°F | 66°F | 57°F | 4.0" |
| November | 37°F | 55°F | 46°F | 3.1" |
| December | 30°F | 47°F | 38°F | 4.9" |
| Index | Shoreham | 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. |
| Eastport, NY | 1,902 | 41 | 18.0% |
| Quiogue, NY | 538 | 41 | 18.0% |
| Riverside, NY | 2,610 | 41 | 18.0% |
| Baiting Hollow, NY | 2,839 | 41 | 18.0% |
| Northampton, NY | 1,627 | 41 | 18.0% |
| Shoreham, NY | 375 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Portland, AR | 375 | 43 | 14.0% |
| Wabbaseka, AR | 375 | 45 | 10.0% |
| Steamboat, AZ | 375 | 17 | 66.0% |
| Rollinsville, CO | 375 | 47 | 6.0% |
| Braswell, GA | 375 | 44 | 12.0% |
| Shoreham, NY | 375 | 43 | 14.0% |
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