| 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. |
| Orient, NY | 1,023 | 37 | 26.0% |
| Springs, NY | 7,246 | 37 | 26.0% |
| Sag Harbor, NY | 1,959 | 37 | 26.0% |
| Wainscott, NY | 342 | 37 | 26.0% |
| Fenwick, CT | 44 | 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% |
Here are the best places to live in New York
Most Dangerous Cities In The US
Check out the 10 safest cities in New York
Most Dangerous States In The US