| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 15°F | 34°F | 24°F | 1.5" |
| February | 16°F | 37°F | 26°F | 1.9" |
| March | 29°F | 53°F | 40°F | 2.8" |
| April | 39°F | 66°F | 52°F | 3.9" |
| May | 49°F | 76°F | 63°F | 4.3" |
| June | 60°F | 85°F | 73°F | 6.0" |
| July | 64°F | 88°F | 76°F | 5.3" |
| August | 62°F | 86°F | 73°F | 4.9" |
| September | 54°F | 81°F | 66°F | 3.4" |
| October | 42°F | 68°F | 54°F | 3.2" |
| November | 31°F | 54°F | 42°F | 2.1" |
| December | 19°F | 37°F | 28°F | 2.6" |
| Index | Aledo | Illinois | National |
| Air quality index | 32 | 41 | 42 |
| Pollution index | 640,499 | 3,148,694 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 300 |
| Days with moderate air quality | 65 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.003% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Joy, IL | 292 | 32 | 36.0% |
| Little York, IL | 423 | 32 | 36.0% |
| Seaton, IL | 278 | 32 | 36.0% |
| Keithsburg, IL | 524 | 32 | 36.0% |
| New Boston, IL | 515 | 32 | 36.0% |
| Aledo, IL | 3,625 | 32 | 36.0% |
| City | Population | Air Quality Index | National Avg. |
| Whitesboro, NY | 3,624 | 27 | 46.0% |
| Valley Grande, AL | 3,627 | 52 | 4.0% |
| Landmark, AR | 3,628 | 45 | 10.0% |
| East Sandwich, MA | 3,628 | 36 | 28.0% |
| Pine Level, AL | 3,621 | 52 | 4.0% |
| Aledo, IL | 3,625 | 32 | 36.0% |
Here are the best places to live in Illinois
See the best places to live in Aledo
These are the 10 cheapest cities in Illinois
Check out the 10 safest cities in Illinois