| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 38°F | 30°F | 2.9" |
| February | 23°F | 40°F | 30°F | 2.0" |
| March | 32°F | 52°F | 41°F | 3.5" |
| April | 42°F | 65°F | 53°F | 3.3" |
| May | 51°F | 73°F | 62°F | 4.2" |
| June | 59°F | 80°F | 69°F | 4.5" |
| July | 63°F | 84°F | 73°F | 3.6" |
| August | 62°F | 83°F | 72°F | 3.9" |
| September | 55°F | 77°F | 65°F | 3.3" |
| October | 45°F | 65°F | 54°F | 3.6" |
| November | 35°F | 54°F | 44°F | 2.6" |
| December | 27°F | 43°F | 34°F | 3.6" |
| Index | Hannibal | Ohio | National |
| Air quality index | 39 | 40 | 42 |
| Pollution index | 325,471 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 318 |
| Days with moderate air quality | 47 |
| 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. |
| Reader, WV | 290 | 31 | 38.0% |
| Pine Grove, WV | 365 | 31 | 38.0% |
| Middlebourne, WV | 717 | 31 | 38.0% |
| Jacksonburg, WV | 79 | 31 | 38.0% |
| Sistersville, WV | 1,334 | 35 | 30.0% |
| Hannibal, OH | 295 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Colony, AL | 295 | 53 | 6.0% |
| Dyess, AR | 295 | 45 | 10.0% |
| Viola, AR | 295 | 36 | 28.0% |
| Canby, CA | 295 | 29 | 42.0% |
| Grenada, CA | 295 | 36 | 28.0% |
| Hannibal, OH | 295 | 39 | 22.0% |
Here are the best places to live in Ohio
Check out the 10 most dangerous cities in Ohio
See the best places to live in Hannibal
These are the largest cities in Ohio