Frohna, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 8 °C (low) to 19.5 °C (high). Annual precipitation averages 1171.7 Millimeters. Frohna is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.3 °C | 5.4 °C | 76.2 mm |
| February | -2.4 °C | 8.3 °C | 76.45 mm |
| March | 2.1 °C | 13.8 °C | 107.95 mm |
| April | 7.7 °C | 20 °C | 132.59 mm |
| May | 13.3 °C | 24.9 °C | 133.6 mm |
| June | 18.2 °C | 29.7 °C | 112.78 mm |
| July | 20.3 °C | 31.3 °C | 93.98 mm |
| August | 18.9 °C | 30.8 °C | 77.22 mm |
| September | 14.3 °C | 27.6 °C | 78.74 mm |
| October | 7.9 °C | 21.4 °C | 86.87 mm |
| November | 2.5 °C | 13.8 °C | 109.22 mm |
| December | -2.2 °C | 7.4 °C | 86.11 mm |
| Annual | 8 °C | 19.5 °C | 1171.71 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |