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| 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 | Northampton | 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. |
| Jamesport, NY | 1,046 | 41 | 18.0% |
| Quogue, NY | 600 | 41 | 18.0% |
| Riverside, NY | 2,610 | 41 | 18.0% |
| Hampton Bays, NY | 14,684 | 41 | 18.0% |
| North Sea, NY | 5,263 | 41 | 18.0% |
| Northampton, NY | 1,627 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Hillsboro, ND | 1,627 | 33 | 34.0% |
| Upper Brookville, NY | 1,627 | 51 | 2.0% |
| Powhatan Point, OH | 1,627 | 39 | 22.0% |
| Latta, SC | 1,627 | 40 | 20.0% |
| Johnson, VT | 1,627 | 37 | 26.0% |
| Northampton, NY | 1,627 | 41 | 18.0% |
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