| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 36°F | 27°F | 5.6" |
| February | 20°F | 37°F | 28°F | 3.2" |
| March | 33°F | 53°F | 42°F | 4.2" |
| April | 44°F | 66°F | 54°F | 7.2" |
| May | 54°F | 75°F | 64°F | 7.5" |
| June | 63°F | 84°F | 73°F | 7.8" |
| July | 64°F | 85°F | 74°F | 7.8" |
| August | 62°F | 84°F | 73°F | 10.6" |
| September | 56°F | 79°F | 66°F | 7.9" |
| October | 45°F | 67°F | 55°F | 7.0" |
| November | 34°F | 53°F | 43°F | 6.5" |
| December | 26°F | 40°F | 32°F | 5.0" |
| Index | Belgium | Illinois | National |
| Air quality index | 42 | 41 | 42 |
| Pollution index | 9,793,540 | 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 | 0.010% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.001% |
| Mercury | 0.040% |
| City | Population | Air Quality Index | National Avg. |
| Muncie, IL | 115 | 42 | 16.0% |
| Indianola, IL | 204 | 42 | 16.0% |
| Perrysville, IN | 512 | 42 | 16.0% |
| Catlin, IL | 1,972 | 42 | 16.0% |
| West Lebanon, IN | 759 | 42 | 16.0% |
| Belgium, IL | 383 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Alpena, AR | 383 | 36 | 28.0% |
| Sublette, IL | 383 | 0 | 100.0% |
| Gentryville, IN | 383 | 6 | 88.0% |
| Kismet, KS | 383 | 15 | 70.0% |
| Fabius, NY | 383 | 37 | 26.0% |
| Belgium, IL | 383 | 42 | 16.0% |
Here are the best places to live in Illinois
See the best places to live in Belgium
Check out the 10 most dangerous cities in Illinois
Safest States In The US