| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 37°F | 29°F | 11.1" |
| February | 17°F | 32°F | 25°F | 2.6" |
| March | 31°F | 50°F | 39°F | 6.7" |
| April | 39°F | 62°F | 50°F | 7.1" |
| May | 48°F | 74°F | 61°F | 1.6" |
| June | 61°F | 85°F | 73°F | 5.4" |
| July | 61°F | 84°F | 73°F | 5.5" |
| August | 63°F | 86°F | 74°F | 10.2" |
| September | 56°F | 79°F | 67°F | 5.9" |
| October | 47°F | 67°F | 57°F | 3.2" |
| November | 33°F | 52°F | 43°F | 5.1" |
| December | 22°F | 36°F | 29°F | 3.3" |
| Index | Westminster | Ohio | National |
| Air quality index | 39 | 40 | 42 |
| Pollution index | 750,178 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 303 |
| Days with moderate air quality | 61 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Chippewa Park, OH | 598 | 39 | 22.0% |
| Vaughnsville, OH | 271 | 39 | 22.0% |
| Fort Shawnee, OH | 5,835 | 39 | 22.0% |
| Lima, OH | 36,908 | 39 | 22.0% |
| Uniopolis, OH | 315 | 39 | 22.0% |
| Westminster, OH | 565 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Carnelian Bay, CA | 565 | 44 | 12.0% |
| Mountain View, CO | 565 | 58 | 16.0% |
| German Valley, IL | 565 | 42 | 16.0% |
| Etna Green, IN | 565 | 37 | 26.0% |
| Richmond, LA | 565 | 34 | 32.0% |
| Westminster, OH | 565 | 39 | 22.0% |
Here are the best places to live in Ohio
These are the 10 cheapest cities in Ohio
Check out the 10 most dangerous cities in Ohio
Safest States In The US