| 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 | West Salem | 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. |
| Jeromesville, OH | 590 | 41 | 18.0% |
| Mifflin, OH | 190 | 41 | 18.0% |
| Savannah, OH | 320 | 41 | 18.0% |
| Bailey Lakes, OH | 309 | 41 | 18.0% |
| Hayesville, OH | 489 | 41 | 18.0% |
| West Salem, OH | 1,540 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Milan, OH | 1,540 | 50 | = 100 |
| Locust Grove, OK | 1,540 | 36 | 28.0% |
| Hometown, PA | 1,540 | 42 | 16.0% |
| Baxter, TN | 1,540 | 25 | 50.0% |
| Dayton, VA | 1,540 | 36 | 28.0% |
| West Salem, OH | 1,540 | 43 | 14.0% |
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