Algona, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 36.5 °F (low) to 56.2 °F (high). Annual precipitation averages 34.1 Inches. Algona is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 7.7 °F | 24.7 °F | 0.8 in. |
| February | 12.2 °F | 29.1 °F | 0.98 in. |
| March | 24.2 °F | 42.1 °F | 1.95 in. |
| April | 35.7 °F | 57.6 °F | 3.61 in. |
| May | 48.1 °F | 69.5 °F | 4.71 in. |
| June | 59.1 °F | 79.6 °F | 5.35 in. |
| July | 62.2 °F | 82.4 °F | 4.22 in. |
| August | 59.5 °F | 80.1 °F | 4.17 in. |
| September | 50.8 °F | 74.3 °F | 3.26 in. |
| October | 38.1 °F | 61.1 °F | 2.34 in. |
| November | 25.5 °F | 44.2 °F | 1.54 in. |
| December | 14.3 °F | 30.1 °F | 1.17 in. |
| Annual | 36.5 °F | 56.2 °F | 34.1 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |