Elkader, Iowa has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.4 °C (low) to 13.9 °C (high). Annual precipitation averages 964.7 Millimeters. Elkader is located in USDA Plant Hardiness Zone 4b. 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 | -13 °C | -3.3 °C | 29.21 mm |
| February | -10.8 °C | -0.7 °C | 31.5 mm |
| March | -4.3 °C | 6.5 °C | 52.83 mm |
| April | 1.9 °C | 14.5 °C | 98.04 mm |
| May | 8.5 °C | 21.1 °C | 120.9 mm |
| June | 14.2 °C | 26.3 °C | 142.49 mm |
| July | 16.3 °C | 28.1 °C | 117.86 mm |
| August | 14.9 °C | 27.1 °C | 104.39 mm |
| September | 10.2 °C | 23.5 °C | 94.23 mm |
| October | 3.4 °C | 16.3 °C | 75.18 mm |
| November | -3.2 °C | 7.2 °C | 56.64 mm |
| December | -9.1 °C | -0.1 °C | 41.4 mm |
| Annual | 2.4 °C | 13.9 °C | 964.67 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |