Denver, 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 16.8 °C (high). Annual precipitation averages 980.2 Millimeters. Denver 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 | -9.4 °C | 0.9 °C | 23.37 mm |
| February | -6.9 °C | 3.8 °C | 33.53 mm |
| March | -1.2 °C | 10.7 °C | 56.64 mm |
| April | 4.7 °C | 17.2 °C | 99.31 mm |
| May | 11.2 °C | 22.8 °C | 141.48 mm |
| June | 16.6 °C | 27.9 °C | 137.16 mm |
| July | 18.9 °C | 30.5 °C | 121.41 mm |
| August | 17.6 °C | 29.6 °C | 105.92 mm |
| September | 12.6 °C | 25.6 °C | 97.54 mm |
| October | 5.9 °C | 18.7 °C | 77.72 mm |
| November | -0.6 °C | 10.4 °C | 49.28 mm |
| December | -6.2 °C | 3.5 °C | 36.83 mm |
| Annual | 5.3 °C | 16.8 °C | 980.19 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 |