Ridgeway, 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 12.9 °C (high). Annual precipitation averages 947.7 Millimeters. Ridgeway is located in USDA Plant Hardiness Zone 4b. 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 | -14.1 °C | -4.4 °C | 26.42 mm |
| February | -12.1 °C | -2 °C | 27.94 mm |
| March | -5.3 °C | 5.2 °C | 48.26 mm |
| April | 1.1 °C | 13.6 °C | 98.3 mm |
| May | 7.9 °C | 20.3 °C | 117.09 mm |
| June | 13.8 °C | 25.6 °C | 155.19 mm |
| July | 15.7 °C | 27.4 °C | 116.33 mm |
| August | 14.2 °C | 26.3 °C | 111.76 mm |
| September | 9.6 °C | 22.8 °C | 94.23 mm |
| October | 2.8 °C | 15.3 °C | 70.1 mm |
| November | -3.8 °C | 6.2 °C | 46.23 mm |
| December | -10.2 °C | -1.2 °C | 35.81 mm |
| Annual | 1.6 °C | 12.9 °C | 947.66 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 4b : -31.7°C to -28.9°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 |