| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 31°F | 39°F | 36°F | 4.2" |
| February | 30°F | 40°F | 35°F | 3.0" |
| March | 36°F | 46°F | 41°F | 6.5" |
| April | 45°F | 56°F | 51°F | 7.6" |
| May | 55°F | 65°F | 60°F | 6.6" |
| June | 63°F | 73°F | 68°F | 3.1" |
| July | 69°F | 79°F | 75°F | 5.8" |
| August | 67°F | 78°F | 73°F | 6.3" |
| September | 63°F | 72°F | 68°F | 8.5" |
| October | 54°F | 63°F | 59°F | 13.5" |
| November | 44°F | 53°F | 49°F | 7.3" |
| December | 35°F | 44°F | 40°F | 6.0" |
| Index | Southold | New York | National |
| Air quality index | 41 | 43 | 42 |
| Pollution index | 4,117,250 | 6,179,275 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 280 |
| Days with moderate air quality | 71 |
| Days w/ poor A.Q. for sensitive groups | 12 |
| Days with unhealthy air quality | 2 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.010% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Sag Harbor, NY | 1,959 | 37 | 26.0% |
| Wainscott, NY | 342 | 37 | 26.0% |
| Fenwick, CT | 44 | 37 | 26.0% |
| East Hampton, NY | 920 | 37 | 26.0% |
| East Marion, NY | 1,144 | 37 | 26.0% |
| Southold, NY | 5,946 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Kingston, TN | 5,946 | 53 | 6.0% |
| Geneva, OH | 5,947 | 34 | 32.0% |
| West Hattiesburg, MS | 5,944 | 35 | 30.0% |
| Fort Lee, VA | 5,944 | 44 | 12.0% |
| Hidden Valley Lake, CA | 5,948 | 31 | 38.0% |
| Southold, NY | 5,946 | 41 | 18.0% |
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