| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 21°F | 39°F | 29°F | 3.5" |
| February | 23°F | 41°F | 31°F | 3.2" |
| March | 36°F | 56°F | 44°F | 3.6" |
| April | 46°F | 68°F | 56°F | 7.4" |
| May | 56°F | 76°F | 65°F | 7.6" |
| June | 64°F | 84°F | 74°F | 10.4" |
| July | 67°F | 87°F | 76°F | 8.6" |
| August | 65°F | 87°F | 75°F | 6.1" |
| September | 58°F | 81°F | 68°F | 8.5" |
| October | 46°F | 68°F | 56°F | 5.6" |
| November | 36°F | 55°F | 45°F | 5.5" |
| December | 27°F | 42°F | 33°F | 6.1" |
| Index | Baylis | Illinois | National |
| Air quality index | 41 | 41 | 50 |
| Pollution index | 222,633 | 3,347,295 | 5,066,862 |
| Measurement | Total |
| Days measured | 241 |
| Days with good air quality | 208 |
| Days with moderate air quality | 33 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City, State | Population | Air Quality Index | National Avg. |
| El Dara, IL | 57 | 41 | 18% |
| New Salem, IL | 131 | 41 | 18% |
| Milton, IL | 277 | 41 | 18% |
| Liberty, IL | 504 | 41 | 18% |
| Griggsville, IL | 1,325 | 41 | 18% |
| Baylis, IL | 190 | 41 | 18% |
| City, State | Population | Air Quality Index | National Avg. |
| Vredenburgh, AL | 190 | 52 | 4% |
| Howard City, NE | 190 | 19 | 62% |
| Manitou, OK | 190 | 43 | 14% |
| Platter, OK | 190 | 325 | 550% |
| Watson, MN | 190 | 32 | 36% |
| Baylis, IL | 190 | 41 | 18% |
Here are the best places to live in Illinois
These are the 10 most affordable cities in Illinois
Top 10 cities in Illinois with the best education system
See the best places to live in & around Baylis