Magnolia, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.4 °F (low) to 60.5 °F (high). Annual precipitation averages 37.2 Inches. Magnolia is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.1 °F | 31.3 °F | 1.91 in. |
| February | 18.6 °F | 35.8 °F | 1.81 in. |
| March | 28.3 °F | 48.2 °F | 2.52 in. |
| April | 38.9 °F | 61.7 °F | 3.63 in. |
| May | 50.7 °F | 72.6 °F | 4.59 in. |
| June | 60.4 °F | 81.4 °F | 4.21 in. |
| July | 64.0 °F | 84.5 °F | 3.86 in. |
| August | 61.8 °F | 82.8 °F | 3.77 in. |
| September | 53.6 °F | 77.3 °F | 3.43 in. |
| October | 42.0 °F | 64.7 °F | 2.92 in. |
| November | 30.9 °F | 49.4 °F | 2.61 in. |
| December | 20.9 °F | 36.5 °F | 1.96 in. |
| Annual | 40.4 °F | 60.5 °F | 37.22 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |