| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 21°F | 37°F | 29°F | 1.9" |
| February | 21°F | 39°F | 29°F | 1.9" |
| March | 32°F | 53°F | 41°F | 3.6" |
| April | 42°F | 66°F | 53°F | 3.3" |
| May | 52°F | 75°F | 63°F | 3.5" |
| June | 60°F | 83°F | 71°F | 5.3" |
| July | 64°F | 85°F | 74°F | 4.3" |
| August | 62°F | 84°F | 73°F | 2.7" |
| September | 55°F | 78°F | 66°F | 3.7" |
| October | 44°F | 66°F | 54°F | 3.3" |
| November | 33°F | 54°F | 43°F | 2.2" |
| December | 27°F | 42°F | 34°F | 3.0" |
| Index | Sunbury | Ohio | National |
| Air quality index | 46 | 40 | 42 |
| Pollution index | 21,574,800 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 237 |
| Days with moderate air quality | 127 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.030% |
| Benzene | 0.230% |
| Carbon Tetrachloride | 0.100% |
| Lead | 0.190% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Waldo, OH | 362 | 41 | 18.0% |
| Hartford, OH | 355 | 41 | 18.0% |
| Marengo, OH | 269 | 41 | 18.0% |
| Centerburg, OH | 1,930 | 41 | 18.0% |
| Ashley, OH | 1,672 | 41 | 18.0% |
| Sunbury, OH | 5,934 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Saint-Césaire, QC | 5,934 | n/a | |
| Taylor, PA | 5,935 | 38 | 24.0% |
| Brownfields, LA | 5,936 | 45 | 10.0% |
| Lake Mills, WI | 5,936 | 37 | 26.0% |
| Roanoke, AL | 5,931 | 38 | 24.0% |
| Sunbury, OH | 5,934 | 46 | 8.0% |
Here are the best places to live in Ohio
Top 10 cities in Ohio with the best education system
Top 10 best public schools in Sunbury
Check out the 10 safest cities in Ohio