| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 32°F | 22°F | 2.6" |
| February | 11°F | 32°F | 22°F | 2.3" |
| March | 21°F | 42°F | 32°F | 2.0" |
| April | 34°F | 57°F | 45°F | 3.3" |
| May | 44°F | 69°F | 57°F | 3.1" |
| June | 54°F | 76°F | 65°F | 4.3" |
| July | 59°F | 81°F | 70°F | 3.2" |
| August | 58°F | 80°F | 69°F | 3.9" |
| September | 50°F | 73°F | 62°F | 3.5" |
| October | 41°F | 61°F | 51°F | 5.5" |
| November | 30°F | 50°F | 40°F | 3.2" |
| December | 20°F | 37°F | 29°F | 3.4" |
| Index | Clayton | 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. |
| Calcium, NY | 3,548 | 35 | 30.0% |
| Depauville, NY | 224 | 35 | 30.0% |
| Plessis, NY | 370 | 35 | 30.0% |
| Three Mile Bay, NY | 182 | 35 | 30.0% |
| Pamelia Center, NY | 441 | 35 | 30.0% |
| Clayton, NY | 1,932 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Milo, ME | 1,932 | 31 | 38.0% |
| Morenci, MI | 1,932 | 39 | 22.0% |
| Peach Lake, NY | 1,932 | 43 | 14.0% |
| Jonestown, PA | 1,932 | 42 | 16.0% |
| Lykens, PA | 1,932 | 42 | 16.0% |
| Clayton, NY | 1,932 | 35 | 30.0% |
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