| 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 | Urbana | 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. |
| West Liberty, OH | 1,600 | 45 | 10.0% |
| St. Paris, OH | 2,126 | 45 | 10.0% |
| South Vienna, OH | 568 | 45 | 10.0% |
| Mutual, OH | 80 | 45 | 10.0% |
| North Hampton, OH | 413 | 45 | 10.0% |
| Urbana, OH | 11,428 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Selkirk, MB | 11,428 | n/a | |
| Roma, TX | 11,427 | 42 | 16.0% |
| Signal Hill, CA | 11,430 | 72 | 44.0% |
| Pontiac, IL | 11,430 | 44 | 12.0% |
| Gardnerville Ranchos, NV | 11,432 | 13 | 74.0% |
| Urbana, OH | 11,428 | 45 | 10.0% |
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