Denver, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.8 °C (low) to 13.9 °C (high). Annual precipitation averages 956.6 Millimeters. Denver is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -12.9 °C | -3.4 °C | 26.92 mm |
| February | -10.7 °C | -1.1 °C | 28.7 mm |
| March | -4.2 °C | 6.4 °C | 50.55 mm |
| April | 2.3 °C | 14.6 °C | 100.33 mm |
| May | 9.2 °C | 21.2 °C | 125.48 mm |
| June | 15.2 °C | 26.6 °C | 148.84 mm |
| July | 16.9 °C | 28.2 °C | 117.35 mm |
| August | 15.4 °C | 27.2 °C | 105.66 mm |
| September | 10.5 °C | 23.8 °C | 91.69 mm |
| October | 3.7 °C | 16.3 °C | 72.39 mm |
| November | -3.2 °C | 7.3 °C | 49.02 mm |
| December | -9.2 °C | -0.2 °C | 39.62 mm |
| Annual | 2.8 °C | 13.9 °C | 956.55 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |