| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 17°F | 33°F | 25°F | 2.8" |
| February | 17°F | 33°F | 25°F | 2.6" |
| March | 25°F | 43°F | 33°F | 2.3" |
| April | 36°F | 58°F | 46°F | 3.3" |
| May | 46°F | 70°F | 58°F | 3.4" |
| June | 55°F | 77°F | 66°F | 4.3" |
| July | 60°F | 82°F | 71°F | 4.1" |
| August | 59°F | 80°F | 69°F | 3.9" |
| September | 52°F | 74°F | 62°F | 3.6" |
| October | 43°F | 61°F | 51°F | 5.4" |
| November | 33°F | 50°F | 41°F | 3.2" |
| December | 24°F | 38°F | 31°F | 3.6" |
| Index | Hannibal | New York | National |
| Air quality index | 37 | 43 | 42 |
| Pollution index | 2,401,950 | 6,179,275 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 337 |
| Days with moderate air quality | 28 |
| 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. |
| Seneca Knolls, NY | 1,759 | 37 | 26.0% |
| Baldwinsville, NY | 7,732 | 37 | 26.0% |
| Red Creek, NY | 705 | 37 | 26.0% |
| SUNY Oswego, NY | 3,656 | 37 | 26.0% |
| Fair Haven, NY | 995 | 37 | 26.0% |
| Hannibal, NY | 693 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Hoboken, GA | 693 | 36 | 28.0% |
| Ainsworth, IA | 693 | 35 | 30.0% |
| Murray, IA | 693 | 39 | 22.0% |
| Tiskilwa, IL | 693 | 0 | 100.0% |
| Green Spring, KY | 693 | 49 | 2.0% |
| Hannibal, NY | 693 | 37 | 26.0% |
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