| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 36°F | 28°F | 3.1" |
| February | 20°F | 39°F | 29°F | 4.1" |
| March | 32°F | 53°F | 41°F | 6.6" |
| April | 42°F | 66°F | 53°F | 6.2" |
| May | 52°F | 75°F | 63°F | 5.9" |
| June | 61°F | 83°F | 71°F | 7.9" |
| July | 63°F | 84°F | 73°F | 7.6" |
| August | 61°F | 84°F | 72°F | 5.1" |
| September | 54°F | 78°F | 65°F | 6.7" |
| October | 44°F | 67°F | 54°F | 5.4" |
| November | 33°F | 53°F | 42°F | 4.5" |
| December | 26°F | 42°F | 33°F | 5.4" |
| Index | Springfield | Ohio | National |
| Air quality index | 45 | 40 | 42 |
| Pollution index | 1,015,950 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 220 |
| Days with moderate air quality | 143 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Cedarville, OH | 3,848 | 45 | 10.0% |
| Urbana, OH | 11,428 | 45 | 10.0% |
| Christiansburg, OH | 481 | 45 | 10.0% |
| North Hampton, OH | 413 | 45 | 10.0% |
| South Solon, OH | 418 | 45 | 10.0% |
| Springfield, OH | 58,957 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Porterville, CA | 59,056 | 66 | 32.0% |
| Greenwood, IN | 58,784 | 54 | 8.0% |
| Fountainebleau, FL | 59,174 | 41 | 18.0% |
| San Rafael, CA | 59,178 | 40 | 20.0% |
| St. Clair Shores, MI | 59,184 | 56 | 12.0% |
| Springfield, OH | 58,957 | 45 | 10.0% |
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