| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 13°F | 30°F | 21°F | 3.8" |
| February | 13°F | 30°F | 21°F | 3.4" |
| March | 22°F | 40°F | 31°F | 3.2" |
| April | 35°F | 56°F | 45°F | 5.2" |
| May | 47°F | 69°F | 58°F | 5.4" |
| June | 55°F | 75°F | 65°F | 6.7" |
| July | 60°F | 80°F | 70°F | 5.8" |
| August | 59°F | 79°F | 68°F | 7.6" |
| September | 51°F | 73°F | 61°F | 5.7" |
| October | 41°F | 60°F | 50°F | 7.5" |
| November | 30°F | 47°F | 38°F | 4.4" |
| December | 20°F | 35°F | 27°F | 4.0" |
| Index | Plessis | New York | National |
| Air quality index | 35 | 43 | 42 |
| Pollution index | 230,538 | 6,179,275 | 2,726,193 |
| Measurement | Total |
| Days measured | 205 |
| Days with good air quality | 198 |
| Days with moderate air quality | 7 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.004% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Clayton, NY | 1,932 | 35 | 30.0% |
| Fort Drum, NY | 13,034 | 35 | 30.0% |
| Theresa, NY | 1,035 | 35 | 30.0% |
| Oxbow, NY | 122 | 35 | 30.0% |
| Depauville, NY | 224 | 35 | 30.0% |
| Plessis, NY | 370 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Naknek, AK | 370 | 31 | 38.0% |
| Beaverville, IL | 370 | 42 | 16.0% |
| Mount Clare, IL | 370 | 54 | 8.0% |
| Royal, IL | 370 | 42 | 16.0% |
| Shelby, IN | 370 | 37 | 26.0% |
| Plessis, NY | 370 | 35 | 30.0% |
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