Riceville, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 1.6 °C (low) to 12.6 °C (high). Annual precipitation averages 932.9 Millimeters. 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 | -14.2 °C | -4.9 °C | 23.11 mm |
| February | -12.1 °C | -2.4 °C | 26.16 mm |
| March | -5.4 °C | 4.6 °C | 45.97 mm |
| April | 1.2 °C | 13.2 °C | 97.54 mm |
| May | 8 °C | 20 °C | 123.44 mm |
| June | 13.8 °C | 25.3 °C | 152.65 mm |
| July | 15.7 °C | 27.2 °C | 115.32 mm |
| August | 14.3 °C | 26 °C | 107.19 mm |
| September | 9.6 °C | 22.6 °C | 94.74 mm |
| October | 2.8 °C | 15.1 °C | 70.1 mm |
| November | -3.9 °C | 5.8 °C | 42.42 mm |
| December | -10.3 °C | -1.7 °C | 34.29 mm |
| Annual | 1.6 °C | 12.6 °C | 932.93 mm |
| 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 : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |