Mona, Iowa has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2 °C (low) to 12.6 °C (high). Annual precipitation averages 922.8 Millimeters. Mona 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 | -14.1 °C | -4.9 °C | 26.16 mm |
| February | -11.9 °C | -2.4 °C | 27.94 mm |
| March | -5.1 °C | 4.5 °C | 49.02 mm |
| April | 1.6 °C | 13.2 °C | 96.52 mm |
| May | 8.5 °C | 20.1 °C | 125.22 mm |
| June | 14.4 °C | 25.6 °C | 135.38 mm |
| July | 16.3 °C | 27.3 °C | 120.65 mm |
| August | 14.8 °C | 26.1 °C | 104.14 mm |
| September | 10.1 °C | 22.7 °C | 89.92 mm |
| October | 3.1 °C | 15.1 °C | 68.58 mm |
| November | -3.7 °C | 5.9 °C | 43.94 mm |
| December | -10.2 °C | -1.7 °C | 35.31 mm |
| Annual | 2 °C | 12.6 °C | 922.78 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 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |