Gladstone, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.7 °C (low) to 18.3 °C (high). Annual precipitation averages 1067.1 Millimeters. Gladstone 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.2 °C | 3.5 °C | 34.54 mm |
| February | -5 °C | 6.4 °C | 41.15 mm |
| March | 0.4 °C | 12.8 °C | 61.98 mm |
| April | 6.2 °C | 18.6 °C | 100.84 mm |
| May | 12.3 °C | 23.7 °C | 142.24 mm |
| June | 17.7 °C | 28.9 °C | 140.97 mm |
| July | 20 °C | 31.3 °C | 118.36 mm |
| August | 18.8 °C | 30.7 °C | 121.41 mm |
| September | 13.9 °C | 26.4 °C | 112.78 mm |
| October | 7.2 °C | 19.8 °C | 89.41 mm |
| November | 0.8 °C | 12.1 °C | 58.42 mm |
| December | -4.6 °C | 5.7 °C | 44.96 mm |
| Annual | 6.7 °C | 18.3 °C | 1067.06 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| 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 | Dfa - Humid Continental Hot Summers With Year Around Precipitation |