| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 35°F | 27°F | 2.1" |
| February | 18°F | 36°F | 27°F | 2.0" |
| March | 29°F | 49°F | 38°F | 3.1" |
| April | 39°F | 63°F | 50°F | 3.2" |
| May | 49°F | 73°F | 61°F | 4.2" |
| June | 58°F | 80°F | 69°F | 4.8" |
| July | 61°F | 83°F | 72°F | 4.5" |
| August | 58°F | 81°F | 69°F | 3.2" |
| September | 52°F | 76°F | 63°F | 3.4" |
| October | 42°F | 64°F | 52°F | 3.6" |
| November | 32°F | 52°F | 41°F | 2.5" |
| December | 25°F | 40°F | 32°F | 2.9" |
| Index | Congress | Ohio | National |
| Air quality index | 43 | 40 | 42 |
| Pollution index | 3,864,840 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 278 |
| Days with moderate air quality | 84 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.030% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.003% |
| Lead | 0.060% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Ashland, OH | 20,304 | 41 | 18.0% |
| Hayesville, OH | 489 | 41 | 18.0% |
| Jeromesville, OH | 590 | 41 | 18.0% |
| Westfield Center, OH | 1,589 | 43 | 14.0% |
| Sterling, OH | 342 | 43 | 14.0% |
| Congress, OH | 282 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Pisinemo, AZ | 282 | 47 | 6.0% |
| Loma Mar, CA | 282 | 35 | 30.0% |
| Pisgah, IA | 282 | 40 | 20.0% |
| Royal Lakes, IL | 282 | 54 | 8.0% |
| Evergreen, LA | 282 | 30 | 40.0% |
| Congress, OH | 282 | 43 | 14.0% |
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