| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 30°F | 21°F | 1.0" |
| February | 13°F | 32°F | 22°F | 1.3" |
| March | 21°F | 41°F | 31°F | 1.5" |
| April | 34°F | 57°F | 45°F | 2.6" |
| May | 45°F | 70°F | 57°F | 3.6" |
| June | 54°F | 76°F | 65°F | 5.2" |
| July | 59°F | 81°F | 70°F | 4.3" |
| August | 57°F | 79°F | 68°F | 3.6" |
| September | 50°F | 73°F | 61°F | 2.8" |
| October | 40°F | 60°F | 50°F | 3.6" |
| November | 29°F | 47°F | 38°F | 1.8" |
| December | 18°F | 35°F | 27°F | 2.0" |
| Index | Peru | New York | National |
| Air quality index | 37 | 43 | 42 |
| Pollution index | 3,508,050 | 6,179,275 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 335 |
| Days with moderate air quality | 30 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.004% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.005% |
| Lead | 0.010% |
| Mercury | 0.003% |
| City | Population | Air Quality Index | National Avg. |
| Redford, NY | 258 | 0 | 100.0% |
| Morrisonville, NY | 1,551 | 37 | 26.0% |
| Willsboro, NY | 605 | 37 | 26.0% |
| Plattsburgh, NY | 19,343 | 37 | 26.0% |
| Au Sable Forks, NY | 416 | 37 | 26.0% |
| Peru, NY | 1,557 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Red Corral, CA | 1,557 | 39 | 22.0% |
| Amity, OR | 1,557 | 32 | 36.0% |
| Glenelg, NB | 1,557 | n/a | |
| Greenland, AR | 1,558 | 44 | 12.0% |
| Baldwin, FL | 1,556 | 43 | 14.0% |
| Peru, NY | 1,557 | 37 | 26.0% |
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