Magnolia, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 39.3 °F (low) to 60.1 °F (high). Annual precipitation averages 33 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. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 12.1 °F | 30.4 °F | 0.72 in. |
| February | 16.2 °F | 35.6 °F | 0.93 in. |
| March | 27.0 °F | 48.5 °F | 1.82 in. |
| April | 38.2 °F | 61.4 °F | 3.37 in. |
| May | 50.4 °F | 72.0 °F | 4.77 in. |
| June | 61.0 °F | 81.8 °F | 5.04 in. |
| July | 64.8 °F | 85.2 °F | 3.75 in. |
| August | 62.4 °F | 83.0 °F | 4.16 in. |
| September | 53.2 °F | 76.7 °F | 3.31 in. |
| October | 40.9 °F | 64.1 °F | 2.46 in. |
| November | 28.0 °F | 48.1 °F | 1.42 in. |
| December | 17.6 °F | 34.9 °F | 1.26 in. |
| Annual | 39.3 °F | 60.1 °F | 33.01 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |