Storm Lake, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.3 °F (low) to 57.1 °F (high). Annual precipitation averages 32.7 Inches. Storm Lake 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 8.9 °F | 26.1 °F | 0.75 in. |
| February | 13.0 °F | 30.3 °F | 0.95 in. |
| March | 25.3 °F | 44.4 °F | 1.77 in. |
| April | 35.9 °F | 58.2 °F | 3.73 in. |
| May | 48.8 °F | 70.1 °F | 4.57 in. |
| June | 59.9 °F | 80.2 °F | 5.33 in. |
| July | 63.0 °F | 82.4 °F | 3.3 in. |
| August | 60.2 °F | 80.1 °F | 4.63 in. |
| September | 51.6 °F | 75.0 °F | 2.87 in. |
| October | 39.0 °F | 61.7 °F | 2.31 in. |
| November | 26.2 °F | 45.2 °F | 1.47 in. |
| December | 15.3 °F | 31.4 °F | 1.06 in. |
| Annual | 37.3 °F | 57.1 °F | 32.74 in. |
| 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 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 |