Martensdale, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.3 °F (low) to 60.5 °F (high). Annual precipitation averages 36.2 Inches. Martensdale 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 | 13.0 °F | 30.8 °F | 1.0 in. |
| February | 16.7 °F | 35.4 °F | 1.29 in. |
| March | 28.0 °F | 48.3 °F | 2.07 in. |
| April | 39.4 °F | 61.8 °F | 3.72 in. |
| May | 51.4 °F | 72.1 °F | 5.19 in. |
| June | 61.7 °F | 81.8 °F | 5.14 in. |
| July | 65.5 °F | 85.7 °F | 4.23 in. |
| August | 63.1 °F | 84.1 °F | 4.09 in. |
| September | 54.2 °F | 77.7 °F | 3.58 in. |
| October | 41.8 °F | 64.0 °F | 2.63 in. |
| November | 29.4 °F | 48.8 °F | 1.86 in. |
| December | 18.9 °F | 36.0 °F | 1.43 in. |
| Annual | 40.3 °F | 60.5 °F | 36.23 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 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |