Gunn City, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.7 °F (low) to 65.2 °F (high). Annual precipitation averages 43.7 Inches. Gunn City is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 19.4 °F | 39.3 °F | 1.48 in. |
| February | 23.1 °F | 44.0 °F | 1.89 in. |
| March | 32.7 °F | 54.8 °F | 2.89 in. |
| April | 42.6 °F | 65.4 °F | 4.61 in. |
| May | 53.7 °F | 74.6 °F | 5.77 in. |
| June | 63.3 °F | 83.4 °F | 5.51 in. |
| July | 67.4 °F | 88.4 °F | 4.84 in. |
| August | 65.0 °F | 87.2 °F | 4.22 in. |
| September | 56.4 °F | 79.8 °F | 4.46 in. |
| October | 44.2 °F | 68.0 °F | 3.47 in. |
| November | 33.3 °F | 54.6 °F | 2.58 in. |
| December | 23.8 °F | 43.4 °F | 1.96 in. |
| Annual | 43.7 °F | 65.2 °F | 43.68 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |