Blairsburg, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.8 °C (low) to 13.9 °C (high). Annual precipitation averages 928.6 Millimeters. Blairsburg 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 | -12.7 °C | -3.4 °C | 23.11 mm |
| February | -10.7 °C | -0.9 °C | 26.67 mm |
| March | -4 °C | 6.4 °C | 52.07 mm |
| April | 2.1 °C | 14.7 °C | 97.03 mm |
| May | 9.6 °C | 21.1 °C | 128.02 mm |
| June | 15.6 °C | 26.8 °C | 148.34 mm |
| July | 17.2 °C | 28.1 °C | 112.01 mm |
| August | 15.5 °C | 26.9 °C | 113.28 mm |
| September | 10.3 °C | 23.7 °C | 82.04 mm |
| October | 3.5 °C | 16.4 °C | 65.79 mm |
| November | -3.2 °C | 7.2 °C | 43.94 mm |
| December | -9.2 °C | -0.3 °C | 36.32 mm |
| Annual | 2.8 °C | 13.9 °C | 928.62 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |