| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 10°F | 28°F | 19°F | 2.2" |
| February | 9°F | 28°F | 18°F | 1.7" |
| March | 19°F | 39°F | 28°F | 2.0" |
| April | 32°F | 52°F | 42°F | 3.1" |
| May | 44°F | 66°F | 55°F | 2.8" |
| June | 54°F | 74°F | 64°F | 3.6" |
| July | 59°F | 79°F | 69°F | 3.1" |
| August | 58°F | 77°F | 67°F | 2.8" |
| September | 51°F | 71°F | 61°F | 2.9" |
| October | 41°F | 58°F | 49°F | 3.3" |
| November | 30°F | 46°F | 38°F | 2.2" |
| December | 19°F | 34°F | 26°F | 2.8" |
| Index | Cape Vincent | New York | National |
| Air quality index | 35 | 43 | 42 |
| Pollution index | 2,401,950 | 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 | 0.010% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.030% |
| Mercury | 0.080% |
| City | Population | Air Quality Index | National Avg. |
| Sackets Harbor, NY | 1,585 | 35 | 30.0% |
| Three Mile Bay, NY | 188 | 35 | 30.0% |
| Chaumont, NY | 717 | 35 | 30.0% |
| Clayton, NY | 2,009 | 35 | 30.0% |
| Dexter, NY | 812 | 35 | 30.0% |
| Cape Vincent, NY | 540 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Crawfordsville, AR | 540 | 45 | 10.0% |
| Hampton, FL | 540 | 35 | 30.0% |
| Jay, FL | 540 | 41 | 18.0% |
| Hillsboro, IN | 540 | 42 | 16.0% |
| Markleville, IN | 540 | 42 | 16.0% |
| Cape Vincent, NY | 540 | 35 | 30.0% |