Gillett Grove, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 36.4 °F (low) to 56.6 °F (high). Annual precipitation averages 31.7 Inches. Gillett Grove 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 | 7.8 °F | 25.2 °F | 0.72 in. |
| February | 11.9 °F | 29.4 °F | 0.85 in. |
| March | 23.9 °F | 42.8 °F | 1.69 in. |
| April | 35.5 °F | 57.9 °F | 3.46 in. |
| May | 48.1 °F | 69.7 °F | 4.34 in. |
| June | 58.8 °F | 79.8 °F | 4.98 in. |
| July | 62.3 °F | 83.0 °F | 3.55 in. |
| August | 59.6 °F | 80.4 °F | 4.05 in. |
| September | 51.1 °F | 74.7 °F | 3.2 in. |
| October | 38.3 °F | 61.3 °F | 2.38 in. |
| November | 25.3 °F | 44.5 °F | 1.45 in. |
| December | 13.9 °F | 30.4 °F | 0.98 in. |
| Annual | 36.4 °F | 56.6 °F | 31.65 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 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 |