| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 11°F | 27°F | 19°F | 3.6" |
| February | 10°F | 28°F | 18°F | 2.3" |
| March | 20°F | 38°F | 28°F | 4.5" |
| April | 34°F | 54°F | 43°F | 5.4" |
| May | 44°F | 65°F | 54°F | 4.2" |
| June | 58°F | 79°F | 68°F | 4.6" |
| July | 61°F | 80°F | 70°F | 6.4" |
| August | 60°F | 80°F | 70°F | 4.9" |
| September | 54°F | 75°F | 63°F | 7.3" |
| October | 45°F | 61°F | 52°F | 9.4" |
| November | 30°F | 46°F | 37°F | 5.3" |
| December | 18°F | 31°F | 24°F | 3.2" |
| Index | Castorland | 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. |
| Croghan, NY | 603 | 35 | 30.0% |
| Herrings, NY | 132 | 35 | 30.0% |
| Lowville, NY | 3,329 | 35 | 30.0% |
| Black River, NY | 1,419 | 35 | 30.0% |
| Deferiet, NY | 282 | 35 | 30.0% |
| Castorland, NY | 378 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Charlotte, IA | 378 | 42 | 16.0% |
| Belle Rive, IL | 378 | 43 | 14.0% |
| Hazel, KY | 378 | 44 | 12.0% |
| Akron, MI | 378 | 26 | 48.0% |
| Annapolis, MO | 378 | 54 | 8.0% |
| Castorland, NY | 378 | 35 | 30.0% |
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