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| 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 | Galena | 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. |
| Centerburg, OH | 1,930 | 41 | 18.0% |
| Marengo, OH | 269 | 41 | 18.0% |
| Ashley, OH | 1,672 | 41 | 18.0% |
| Sparta, OH | 179 | 41 | 18.0% |
| Hartford, OH | 355 | 41 | 18.0% |
| Galena, OH | 753 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Amity, AR | 753 | 32 | 36.0% |
| Aguila, AZ | 753 | 43 | 14.0% |
| Mesa Verde, CA | 753 | 13 | 74.0% |
| Volcano, HI | 753 | 16 | 68.0% |
| Blairstown, IA | 753 | 39 | 22.0% |
| Galena, OH | 753 | 46 | 8.0% |
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