| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 21°F | 41°F | 32°F | 3.4" |
| February | 21°F | 41°F | 31°F | 3.0" |
| March | 27°F | 48°F | 38°F | 3.8" |
| April | 37°F | 59°F | 48°F | 3.9" |
| May | 46°F | 67°F | 57°F | 3.8" |
| June | 56°F | 77°F | 67°F | 4.4" |
| July | 64°F | 83°F | 73°F | 3.5" |
| August | 61°F | 82°F | 72°F | 3.0" |
| September | 55°F | 76°F | 66°F | 3.9" |
| October | 44°F | 66°F | 55°F | 5.2" |
| November | 34°F | 56°F | 45°F | 3.3" |
| December | 27°F | 47°F | 37°F | 4.8" |
| Index | Westhampton | New York | National |
| Air quality index | 41 | 43 | 42 |
| Pollution index | 39,208,800 | 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 | 0.060% |
| 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% |
| Flanders, NY | 5,170 | 41 | 18.0% |
| Northville, NY | 1,607 | 41 | 18.0% |
| Riverhead, NY | 13,879 | 41 | 18.0% |
| Southold, NY | 5,946 | 41 | 18.0% |
| Westhampton, NY | 3,105 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Trois-Pistoles, QC | 3,105 | n/a | |
| Parowan, UT | 3,104 | 44 | 12.0% |
| Harbour Grace, NL | 3,104 | n/a | |
| Athabasca, AB | 3,104 | n/a | |
| Mount Pocono, PA | 3,106 | 34 | 32.0% |
| Westhampton, NY | 3,105 | 41 | 18.0% |
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