Crawfordsville, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.9 °C (low) to 16 °C (high). Annual precipitation averages 964.9 Millimeters. Crawfordsville is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.7 °C | -0.4 °C | 34.8 mm |
| February | -7.7 °C | 2.1 °C | 41.91 mm |
| March | -1.8 °C | 9.3 °C | 60.45 mm |
| April | 4.3 °C | 16.8 °C | 94.74 mm |
| May | 10.9 °C | 22.7 °C | 129.79 mm |
| June | 16.5 °C | 27.8 °C | 127 mm |
| July | 18.4 °C | 29.6 °C | 105.16 mm |
| August | 17.1 °C | 28.7 °C | 106.17 mm |
| September | 12.1 °C | 25.3 °C | 89.15 mm |
| October | 5.6 °C | 18.2 °C | 74.17 mm |
| November | -0.8 °C | 9.6 °C | 57.4 mm |
| December | -6.4 °C | 2.4 °C | 44.2 mm |
| Annual | 4.9 °C | 16 °C | 964.94 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |