| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 36°F | 28°F | 2.2" |
| February | 20°F | 36°F | 28°F | 2.2" |
| March | 30°F | 49°F | 38°F | 2.9" |
| April | 40°F | 62°F | 50°F | 3.3" |
| May | 51°F | 73°F | 62°F | 3.9" |
| June | 60°F | 81°F | 70°F | 4.7" |
| July | 63°F | 84°F | 73°F | 3.8" |
| August | 61°F | 82°F | 71°F | 3.7" |
| September | 55°F | 77°F | 65°F | 3.9" |
| October | 45°F | 65°F | 54°F | 4.2" |
| November | 35°F | 53°F | 43°F | 3.0" |
| December | 27°F | 41°F | 33°F | 3.0" |
| Index | Elyria | Ohio | National |
| Air quality index | 50 | 40 | 42 |
| Pollution index | 9,912,140 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 185 |
| Days with moderate air quality | 173 |
| Days w/ poor A.Q. for sensitive groups | 7 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.120% |
| Benzene | 0.080% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.440% |
| Mercury | 0.260% |
| City | Population | Air Quality Index | National Avg. |
| Wellington, OH | 4,466 | 50 | = 100 |
| Avon Lake, OH | 24,309 | 50 | = 100 |
| Strongsville, OH | 44,675 | 50 | = 100 |
| Sheffield, OH | 4,299 | 50 | = 100 |
| Amherst, OH | 12,193 | 50 | = 100 |
| Elyria, OH | 53,844 | 50 | = 100 |
| City | Population | Air Quality Index | National Avg. |
| Rosemead, CA | 53,850 | 72 | 44.0% |
| Aspen Hill, MD | 53,869 | 47 | 6.0% |
| Novato, CA | 53,781 | 40 | 20.0% |
| Minnetonka, MN | 53,760 | 46 | 8.0% |
| Paramount, CA | 53,949 | 72 | 44.0% |
| Elyria, OH | 53,844 | 50 | = 100 |
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