| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 36°F | 27°F | 3.5" |
| February | 18°F | 37°F | 27°F | 3.0" |
| March | 27°F | 49°F | 37°F | 3.6" |
| April | 37°F | 64°F | 50°F | 3.6" |
| May | 47°F | 73°F | 60°F | 4.1" |
| June | 56°F | 81°F | 68°F | 4.4" |
| July | 59°F | 84°F | 72°F | 4.6" |
| August | 58°F | 83°F | 70°F | 3.9" |
| September | 52°F | 77°F | 64°F | 3.6" |
| October | 42°F | 64°F | 52°F | 4.2" |
| November | 32°F | 53°F | 42°F | 3.1" |
| December | 24°F | 41°F | 32°F | 3.8" |
| Index | Hiram | Ohio | National |
| Air quality index | 43 | 40 | 42 |
| Pollution index | 3,855,270 | 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 | 0.003% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.020% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Newton Falls, OH | 4,494 | 42 | 16.0% |
| Parkman, OH | 166 | 42 | 16.0% |
| Leavittsburg, OH | 1,468 | 42 | 16.0% |
| Craig Beach, OH | 1,645 | 42 | 16.0% |
| West Farmington, OH | 490 | 42 | 16.0% |
| Hiram, OH | 1,332 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| University Heights, IA | 1,332 | 35 | 30.0% |
| Chatsworth, IL | 1,332 | 44 | 12.0% |
| Bass Lake, IN | 1,332 | 42 | 16.0% |
| Flemington, PA | 1,332 | 35 | 30.0% |
| Saint-Alexis, QC | 1,332 | n/a | |
| Hiram, OH | 1,332 | 43 | 14.0% |
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