| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 16°F | 35°F | 25°F | 2.3" |
| February | 16°F | 37°F | 26°F | 2.6" |
| March | 25°F | 47°F | 35°F | 2.9" |
| April | 36°F | 62°F | 49°F | 3.1" |
| May | 47°F | 73°F | 60°F | 3.8" |
| June | 57°F | 81°F | 68°F | 5.2" |
| July | 62°F | 85°F | 73°F | 5.4" |
| August | 59°F | 83°F | 71°F | 4.4" |
| September | 53°F | 77°F | 64°F | 3.8" |
| October | 42°F | 64°F | 52°F | 4.9" |
| November | 31°F | 52°F | 41°F | 2.6" |
| December | 22°F | 40°F | 31°F | 3.7" |
| Index | Schenectady | 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. |
| Amsterdam, NY | 17,823 | 37 | 26.0% |
| East Glenville, NY | 11,184 | 37 | 26.0% |
| Stillwater, NY | 1,959 | 37 | 26.0% |
| Ballston Spa, NY | 5,675 | 37 | 26.0% |
| Altamont, NY | 1,754 | 37 | 26.0% |
| Schenectady, NY | 65,336 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Sammamish, WA | 65,265 | 45 | 10.0% |
| Medicine Hat, AB | 65,247 | n/a | |
| Rowlett, TX | 65,426 | 51 | 2.0% |
| Halton Hills, ON | 65,483 | n/a | |
| Castle Rock, CO | 65,176 | 58 | 16.0% |
| Schenectady, NY | 65,336 | 37 | 26.0% |
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