Gilman City, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.3 °C (low) to 16.7 °C (high). Annual precipitation averages 1003.1 Millimeters. Gilman City is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.1 °C | 1.1 °C | 26.67 mm |
| February | -6.9 °C | 4.1 °C | 38.1 mm |
| March | -1.2 °C | 10.8 °C | 59.44 mm |
| April | 4.6 °C | 16.9 °C | 97.79 mm |
| May | 11.1 °C | 22.5 °C | 142.75 mm |
| June | 16.6 °C | 27.8 °C | 134.62 mm |
| July | 18.7 °C | 30.2 °C | 118.62 mm |
| August | 17.6 °C | 29.3 °C | 109.47 mm |
| September | 12.6 °C | 25.3 °C | 102.62 mm |
| October | 6 °C | 18.3 °C | 80.26 mm |
| November | -0.6 °C | 10.6 °C | 52.32 mm |
| December | -6.2 °C | 3.7 °C | 40.39 mm |
| Annual | 5.3 °C | 16.7 °C | 1003.05 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |