| 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 | Chatham | New York | National |
| Air quality index | 37 | 43 | 42 |
| Pollution index | 4,483,560 | 6,179,275 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 320 |
| Days with moderate air quality | 44 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.005% |
| Lead | 0.020% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Athens, NY | 1,743 | 37 | 26.0% |
| Jefferson Heights, NY | 1,005 | 37 | 26.0% |
| Niverville, NY | 1,414 | 37 | 26.0% |
| Valatie, NY | 1,525 | 37 | 26.0% |
| East Nassau, NY | 457 | 37 | 26.0% |
| Chatham, NY | 1,692 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| McAlmont, AR | 1,692 | 45 | 10.0% |
| Vinton, TX | 1,692 | 53 | 6.0% |
| Hancock, MD | 1,691 | 40 | 20.0% |
| McComb, OH | 1,693 | 39 | 22.0% |
| Victoria, NL | 1,691 | n/a | |
| Chatham, NY | 1,692 | 37 | 26.0% |
Here are the best places to live in New York
Most Dangerous States In The US
See the best places to live in Chatham
Check out the 10 safest cities in New York