| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 37°F | 28°F | 3.3" |
| February | 20°F | 38°F | 28°F | 3.0" |
| March | 29°F | 49°F | 38°F | 3.2" |
| April | 39°F | 63°F | 51°F | 3.8" |
| May | 50°F | 73°F | 61°F | 3.7" |
| June | 60°F | 82°F | 71°F | 4.5" |
| July | 63°F | 85°F | 74°F | 4.5" |
| August | 62°F | 84°F | 73°F | 4.4" |
| September | 56°F | 77°F | 66°F | 4.2" |
| October | 45°F | 66°F | 55°F | 4.5" |
| November | 35°F | 54°F | 44°F | 3.4" |
| December | 26°F | 41°F | 33°F | 3.5" |
| Index | Westlake | Ohio | National |
| Air quality index | 50 | 40 | 42 |
| Pollution index | 10,021,400 | 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 | 0.010% |
| Benzene | 0.150% |
| Carbon Tetrachloride | 0.030% |
| Lead | 0.040% |
| Mercury | 0.030% |
| City | Population | Air Quality Index | National Avg. |
| Richfield, OH | 3,767 | 43 | 14.0% |
| LaGrange, OH | 2,355 | 50 | = 100 |
| Elyria, OH | 53,844 | 50 | = 100 |
| Sheffield Lake, OH | 9,001 | 50 | = 100 |
| Broadview Heights, OH | 19,195 | 50 | = 100 |
| Westlake, OH | 32,154 | 50 | = 100 |
| City | Population | Air Quality Index | National Avg. |
| Goleta, CA | 32,142 | 44 | 12.0% |
| Lake Magdalene, FL | 32,180 | 43 | 14.0% |
| Dania Beach, FL | 32,125 | 41 | 18.0% |
| Statesboro, GA | 32,115 | 39 | 22.0% |
| Weatherford, TX | 32,110 | 33 | 34.0% |
| Westlake, OH | 32,154 | 50 | = 100 |
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