| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 36°F | 27°F | 1.7" |
| February | 19°F | 38°F | 28°F | 1.8" |
| March | 33°F | 54°F | 42°F | 2.3" |
| April | 42°F | 67°F | 54°F | 4.2" |
| May | 53°F | 77°F | 64°F | 4.2" |
| June | 63°F | 85°F | 73°F | 5.0" |
| July | 64°F | 85°F | 74°F | 4.5" |
| August | 62°F | 84°F | 73°F | 2.4" |
| September | 56°F | 80°F | 67°F | 3.4" |
| October | 44°F | 67°F | 55°F | 3.7" |
| November | 33°F | 53°F | 42°F | 2.8" |
| December | 24°F | 39°F | 31°F | 2.7" |
| Index | Mahomet | Illinois | National |
| Air quality index | 42 | 41 | 42 |
| Pollution index | 703,218 | 3,148,694 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 281 |
| Days with moderate air quality | 84 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Fisher, IL | 1,917 | 42 | 16.0% |
| Philo, IL | 1,398 | 42 | 16.0% |
| Bondville, IL | 455 | 42 | 16.0% |
| Urbana, IL | 42,461 | 42 | 16.0% |
| Lake of the Woods, IL | 2,515 | 42 | 16.0% |
| Mahomet, IL | 8,888 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Port Wentworth, GA | 8,886 | 39 | 22.0% |
| Tremonton, UT | 8,890 | 44 | 12.0% |
| Airway Heights, WA | 8,885 | 43 | 14.0% |
| Waterford, CA | 8,884 | 49 | 2.0% |
| Georgetown, SC | 8,884 | 14 | 72.0% |
| Mahomet, IL | 8,888 | 42 | 16.0% |
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