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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 15°F | 31°F | 23°F | 4.6" |
| February | 12°F | 31°F | 22°F | 3.5" |
| March | 19°F | 39°F | 29°F | 5.4" |
| April | 32°F | 56°F | 44°F | 5.6" |
| May | 42°F | 66°F | 54°F | 3.9" |
| June | 54°F | 78°F | 66°F | 5.7" |
| July | 57°F | 79°F | 68°F | 4.4" |
| August | 58°F | 81°F | 69°F | 3.8" |
| September | 50°F | 75°F | 62°F | 2.0" |
| October | 43°F | 62°F | 52°F | 14.1" |
| November | 28°F | 48°F | 37°F | 6.2" |
| December | 19°F | 33°F | 26°F | 4.8" |
| Index | Nassau | New York | National |
| Air quality index | 37 | 43 | 42 |
| Pollution index | 7,615,940 | 6,179,275 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 322 |
| Days with moderate air quality | 43 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.080% |
| Carbon Tetrachloride | 0.030% |
| Lead | 0.040% |
| Mercury | 0.630% |
| City | Population | Air Quality Index | National Avg. |
| Ghent, NY | 499 | 37 | 26.0% |
| Kinderhook, NY | 1,379 | 37 | 26.0% |
| Albany, NY | 96,860 | 37 | 26.0% |
| Westmere, NY | 6,961 | 37 | 26.0% |
| Castleton-on-Hudson, NY | 1,483 | 37 | 26.0% |
| Nassau, NY | 1,125 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Kirklin, IN | 1,125 | 42 | 16.0% |
| New Knoxville, OH | 1,125 | 39 | 22.0% |
| Byrdstown, TN | 1,125 | 25 | 50.0% |
| Chester Gap, VA | 1,125 | 38 | 24.0% |
| Homeland, GA | 1,124 | 36 | 28.0% |
| Nassau, NY | 1,125 | 37 | 26.0% |
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