Steamboat Rock, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.5 °F (low) to 57.7 °F (high). Annual precipitation averages 36.9 Inches. Steamboat 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 | 9.6 °F | 26.5 °F | 0.96 in. |
| February | 13.6 °F | 31.4 °F | 1.15 in. |
| March | 25.2 °F | 44.5 °F | 2.1 in. |
| April | 36.5 °F | 59.1 °F | 3.85 in. |
| May | 49.0 °F | 70.6 °F | 5.08 in. |
| June | 59.7 °F | 80.3 °F | 5.81 in. |
| July | 62.9 °F | 83.3 °F | 4.25 in. |
| August | 60.1 °F | 81.3 °F | 4.17 in. |
| September | 51.3 °F | 75.3 °F | 3.42 in. |
| October | 39.1 °F | 62.0 °F | 2.67 in. |
| November | 26.8 °F | 45.6 °F | 1.89 in. |
| December | 16.0 °F | 32.2 °F | 1.53 in. |
| Annual | 37.5 °F | 57.7 °F | 36.88 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |