| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 34°F | 25°F | 3.2" |
| February | 19°F | 36°F | 27°F | 3.2" |
| March | 32°F | 51°F | 41°F | 5.1" |
| April | 42°F | 64°F | 52°F | 6.5" |
| May | 53°F | 74°F | 63°F | 7.0" |
| June | 62°F | 82°F | 72°F | 7.0" |
| July | 65°F | 85°F | 74°F | 7.2" |
| August | 64°F | 84°F | 73°F | 8.3" |
| September | 57°F | 78°F | 66°F | 7.1" |
| October | 45°F | 65°F | 54°F | 6.0" |
| November | 34°F | 52°F | 42°F | 4.6" |
| December | 23°F | 38°F | 30°F | 3.8" |
| Index | Magnolia | Illinois | National |
| Air quality index | 0 | 41 | 42 |
| Pollution index | 339,156 | 3,148,694 | 2,726,193 |
| Measurement | Total |
| Days measured | 335 |
| Days with good air quality | 334 |
| Days with moderate air quality | 1 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Lostant, IL | 463 | 0 | 100.0% |
| De Pue, IL | 1,724 | 0 | 100.0% |
| Spring Valley, IL | 5,172 | 0 | 100.0% |
| Oglesby, IL | 3,652 | 0 | 100.0% |
| McNabb, IL | 237 | 0 | 100.0% |
| Magnolia, IL | 263 | 0 | 100.0% |
| City | Population | Air Quality Index | National Avg. |
| Cooper Landing, AK | 263 | 31 | 38.0% |
| Lemon Cove, CA | 263 | 66 | 32.0% |
| Hancock, IA | 263 | 40 | 20.0% |
| Randolph, IA | 263 | 40 | 20.0% |
| Stanley, ID | 263 | 36 | 28.0% |
| Magnolia, IL | 263 | 0 | 100.0% |
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