Riceville, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 34.9 °F (low) to 54.6 °F (high). Annual precipitation averages 36.7 Inches. Riceville 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 | 6.4 °F | 23.2 °F | 0.91 in. |
| February | 10.3 °F | 27.6 °F | 1.03 in. |
| March | 22.3 °F | 40.2 °F | 1.81 in. |
| April | 34.2 °F | 55.7 °F | 3.84 in. |
| May | 46.4 °F | 68.0 °F | 4.86 in. |
| June | 56.9 °F | 77.6 °F | 6.01 in. |
| July | 60.3 °F | 80.9 °F | 4.54 in. |
| August | 57.7 °F | 78.8 °F | 4.22 in. |
| September | 49.2 °F | 72.6 °F | 3.73 in. |
| October | 37.0 °F | 59.1 °F | 2.76 in. |
| November | 24.9 °F | 42.5 °F | 1.67 in. |
| December | 13.4 °F | 28.9 °F | 1.35 in. |
| Annual | 34.9 °F | 54.6 °F | 36.73 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 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |