Masonville, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 36.3 °F (low) to 56.7 °F (high). Annual precipitation averages 38.7 Inches. Masonville is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 8.4 °F | 26.0 °F | 1.18 in. |
| February | 12.3 °F | 30.3 °F | 1.28 in. |
| March | 24.2 °F | 43.6 °F | 2.08 in. |
| April | 35.4 °F | 57.8 °F | 3.87 in. |
| May | 47.4 °F | 69.5 °F | 4.7 in. |
| June | 58.2 °F | 79.2 °F | 5.93 in. |
| July | 61.3 °F | 82.1 °F | 4.76 in. |
| August | 58.7 °F | 80.3 °F | 4.31 in. |
| September | 50.0 °F | 74.1 °F | 3.8 in. |
| October | 37.9 °F | 61.0 °F | 2.99 in. |
| November | 26.0 °F | 45.0 °F | 2.19 in. |
| December | 15.3 °F | 31.8 °F | 1.62 in. |
| Annual | 36.3 °F | 56.7 °F | 38.71 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |