Gruver, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.1 °C (low) to 13.1 °C (high). Annual precipitation averages 794.3 Millimeters. Gruver 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 | -13.8 °C | -4.4 °C | 20.83 mm |
| February | -11.7 °C | -2.1 °C | 21.08 mm |
| March | -4.9 °C | 4.9 °C | 42.93 mm |
| April | 1.7 °C | 13.8 °C | 85.09 mm |
| May | 8.7 °C | 20.5 °C | 116.84 mm |
| June | 14.7 °C | 26.1 °C | 122.68 mm |
| July | 16.7 °C | 28 °C | 94.49 mm |
| August | 15.1 °C | 26.5 °C | 90.93 mm |
| September | 10.3 °C | 23.4 °C | 80.77 mm |
| October | 3.1 °C | 15.7 °C | 60.96 mm |
| November | -4 °C | 6.4 °C | 32.51 mm |
| December | -10.4 °C | -1.5 °C | 25.15 mm |
| Annual | 2.1 °C | 13.1 °C | 794.26 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 | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |