Gilmore City, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 36.8 °F (low) to 56.9 °F (high). Annual precipitation averages 34 Inches. Gilmore City 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 | 8.3 °F | 25.7 °F | 0.88 in. |
| February | 12.5 °F | 30.0 °F | 1.06 in. |
| March | 24.5 °F | 43.5 °F | 1.98 in. |
| April | 35.9 °F | 58.4 °F | 3.64 in. |
| May | 48.5 °F | 69.9 °F | 4.72 in. |
| June | 59.3 °F | 79.9 °F | 5.18 in. |
| July | 62.6 °F | 82.9 °F | 3.88 in. |
| August | 59.9 °F | 80.4 °F | 4.4 in. |
| September | 50.9 °F | 74.6 °F | 3.01 in. |
| October | 38.5 °F | 61.6 °F | 2.36 in. |
| November | 25.7 °F | 45.0 °F | 1.58 in. |
| December | 14.6 °F | 31.0 °F | 1.26 in. |
| Annual | 36.8 °F | 56.9 °F | 33.95 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 |