| 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 | North Royalton | Ohio | National |
| Air quality index | 50 | 40 | 42 |
| Pollution index | 28,421,300 | 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 | 0.220% |
| Benzene | 0.280% |
| Carbon Tetrachloride | 0.170% |
| Lead | 0.250% |
| Mercury | 0.090% |
| City | Population | Air Quality Index | National Avg. |
| Pigeon Creek, OH | 948 | 43 | 14.0% |
| Twinsburg Heights, OH | 787 | 43 | 14.0% |
| Cuyahoga Falls, OH | 49,191 | 43 | 14.0% |
| Montrose-Ghent, OH | 5,677 | 43 | 14.0% |
| Peninsula, OH | 654 | 43 | 14.0% |
| North Royalton, OH | 30,179 | 50 | = 100 |
| City | Population | Air Quality Index | National Avg. |
| Elizabethtown, KY | 30,179 | 39 | 22.0% |
| Ballwin, MO | 30,177 | 54 | 8.0% |
| Lawrenceville, GA | 30,125 | 37 | 26.0% |
| Fountain, CO | 30,240 | 45 | 10.0% |
| San Lorenzo, CA | 30,117 | 40 | 20.0% |
| North Royalton, OH | 30,179 | 50 | = 100 |
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