| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 32°F | 22°F | 1.8" |
| February | 11°F | 35°F | 23°F | 2.0" |
| March | 21°F | 44°F | 32°F | 2.3" |
| April | 34°F | 59°F | 46°F | 3.1" |
| May | 47°F | 73°F | 60°F | 4.4" |
| June | 54°F | 78°F | 66°F | 4.6" |
| July | 59°F | 84°F | 71°F | 4.3" |
| August | 56°F | 81°F | 69°F | 3.3" |
| September | 49°F | 75°F | 62°F | 3.5" |
| October | 40°F | 63°F | 51°F | 4.2" |
| November | 28°F | 50°F | 38°F | 2.0" |
| December | 20°F | 38°F | 29°F | 3.1" |
| Index | Salem | New York | National |
| Air quality index | 35 | 43 | 42 |
| Pollution index | 6,535,100 | 6,179,275 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 345 |
| Days with moderate air quality | 20 |
| 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 | 0.010% |
| Lead | 0.090% |
| Mercury | 0.050% |
| City | Population | Air Quality Index | National Avg. |
| Greenwich, NY | 2,083 | 35 | 30.0% |
| Argyle, NY | 403 | 35 | 30.0% |
| Schuylerville, NY | 1,408 | 35 | 30.0% |
| Manchester, VT | 583 | 35 | 30.0% |
| Cambridge, NY | 2,274 | 35 | 30.0% |
| Salem, NY | 933 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Mi-Wuk Village, CA | 933 | 39 | 22.0% |
| Woods Hole, MA | 933 | 36 | 28.0% |
| Grawn, MI | 933 | 36 | 28.0% |
| Charlestown, NH | 933 | 34 | 32.0% |
| Brady Lake, OH | 933 | 43 | 14.0% |
| Salem, NY | 933 | 35 | 30.0% |
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