Junction City, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 6.8 °C (low) to 19.5 °C (high). Annual precipitation averages 1172.5 Millimeters. Junction City is located in USDA Plant Hardiness Zone 6b. 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 | -5.3 °C | 5.8 °C | 75.18 mm |
| February | -3.6 °C | 8.8 °C | 72.14 mm |
| March | 0.9 °C | 14.2 °C | 94.74 mm |
| April | 6.3 °C | 20.3 °C | 138.94 mm |
| May | 12.2 °C | 24.7 °C | 145.8 mm |
| June | 16.6 °C | 29.2 °C | 87.38 mm |
| July | 19.1 °C | 31.1 °C | 95.25 mm |
| August | 17.8 °C | 30.8 °C | 86.87 mm |
| September | 13.2 °C | 27.2 °C | 85.85 mm |
| October | 6.7 °C | 21.1 °C | 88.14 mm |
| November | 1.2 °C | 13.5 °C | 116.59 mm |
| December | -3.2 °C | 7.5 °C | 85.6 mm |
| Annual | 6.8 °C | 19.5 °C | 1172.48 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |