| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 8°F | 28°F | 18°F | 1.5" |
| February | 10°F | 29°F | 19°F | 1.3" |
| March | 19°F | 40°F | 29°F | 1.6" |
| April | 33°F | 56°F | 45°F | 3.0" |
| May | 45°F | 70°F | 57°F | 3.2" |
| June | 55°F | 77°F | 66°F | 4.9" |
| July | 59°F | 82°F | 70°F | 4.2" |
| August | 57°F | 80°F | 68°F | 3.5" |
| September | 49°F | 73°F | 61°F | 4.0" |
| October | 39°F | 60°F | 49°F | 3.8" |
| November | 28°F | 47°F | 37°F | 2.1" |
| December | 17°F | 33°F | 25°F | 2.4" |
| Index | Potsdam | New York | National |
| Air quality index | 0 | 43 | 42 |
| Pollution index | 1,088,560 | 6,179,275 | 2,726,193 |
| Measurement | Total |
| Days measured | 356 |
| Days with good air quality | 356 |
| Days with moderate air quality | 0 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.260% |
| Mercury | 0.050% |
| City | Population | Air Quality Index | National Avg. |
| Madrid, NY | 805 | 0 | 100.0% |
| Winthrop, NY | 174 | 0 | 100.0% |
| Parishville, NY | 623 | 0 | 100.0% |
| Norfolk, NY | 886 | 0 | 100.0% |
| Canton, NY | 6,486 | 0 | 100.0% |
| Potsdam, NY | 9,003 | 0 | 100.0% |
| City | Population | Air Quality Index | National Avg. |
| Roxborough Park, CO | 9,004 | 58 | 16.0% |
| Springfield, FL | 9,004 | 38 | 24.0% |
| Sheffield Lake, OH | 9,001 | 50 | = 100 |
| Groton, CT | 8,999 | 37 | 26.0% |
| Lincoln City, OR | 9,007 | 17 | 66.0% |
| Potsdam, NY | 9,003 | 0 | 100.0% |
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