Marble Rock, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 36.9 °F (low) to 56.7 °F (high). Annual precipitation averages 37.3 Inches. Marble Rock is located in USDA Plant Hardiness Zone 5a. 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 | 8.5 °F | 25.3 °F | 1.0 in. |
| February | 12.6 °F | 29.7 °F | 1.13 in. |
| March | 24.4 °F | 42.6 °F | 1.89 in. |
| April | 36.0 °F | 58.1 °F | 3.91 in. |
| May | 48.4 °F | 70.1 °F | 5.26 in. |
| June | 59.1 °F | 79.7 °F | 6.04 in. |
| July | 62.3 °F | 82.7 °F | 4.37 in. |
| August | 59.7 °F | 80.5 °F | 4.38 in. |
| September | 51.0 °F | 74.6 °F | 3.43 in. |
| October | 38.7 °F | 61.2 °F | 2.76 in. |
| November | 26.4 °F | 44.5 °F | 1.75 in. |
| December | 15.3 °F | 31.0 °F | 1.38 in. |
| Annual | 36.9 °F | 56.7 °F | 37.3 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 5a : -20°F to -15°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 |