Blakesburg, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.6 °C (low) to 15.8 °C (high). Annual precipitation averages 972.1 Millimeters. Blakesburg is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.2 °C | -0.4 °C | 31.75 mm |
| February | -8.1 °C | 2.2 °C | 39.88 mm |
| March | -2.1 °C | 9.4 °C | 56.9 mm |
| April | 4 °C | 16.5 °C | 98.3 mm |
| May | 10.7 °C | 21.9 °C | 132.08 mm |
| June | 16.2 °C | 27.3 °C | 137.41 mm |
| July | 18.3 °C | 29.4 °C | 108.71 mm |
| August | 16.9 °C | 28.5 °C | 104.65 mm |
| September | 12 °C | 24.7 °C | 96.01 mm |
| October | 5.4 °C | 17.8 °C | 72.9 mm |
| November | -1.3 °C | 9.4 °C | 54.61 mm |
| December | -6.9 °C | 2.5 °C | 38.86 mm |
| Annual | 4.6 °C | 15.8 °C | 972.06 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 |