Blairsburg, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.1 °F (low) to 57 °F (high). Annual precipitation averages 36.6 Inches. 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 | 9.1 °F | 25.8 °F | 0.91 in. |
| February | 12.7 °F | 30.4 °F | 1.05 in. |
| March | 24.8 °F | 43.5 °F | 2.05 in. |
| April | 35.8 °F | 58.4 °F | 3.82 in. |
| May | 49.3 °F | 69.9 °F | 5.04 in. |
| June | 60.0 °F | 80.2 °F | 5.84 in. |
| July | 62.9 °F | 82.6 °F | 4.41 in. |
| August | 59.9 °F | 80.5 °F | 4.46 in. |
| September | 50.5 °F | 74.7 °F | 3.23 in. |
| October | 38.3 °F | 61.6 °F | 2.59 in. |
| November | 26.3 °F | 45.0 °F | 1.73 in. |
| December | 15.4 °F | 31.4 °F | 1.43 in. |
| Annual | 37.1 °F | 57 °F | 36.56 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |