Pomona, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.5 °C (low) to 19.4 °C (high). Annual precipitation averages 1197.1 Millimeters. Pomona is located in USDA Plant Hardiness Zone 7a. 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 | -4.6 °C | 6.3 °C | 72.39 mm |
| February | -2.7 °C | 8.9 °C | 74.68 mm |
| March | 1.6 °C | 14.2 °C | 116.08 mm |
| April | 7.2 °C | 20 °C | 138.43 mm |
| May | 12.4 °C | 24.2 °C | 134.87 mm |
| June | 17.2 °C | 28.6 °C | 95.76 mm |
| July | 19.3 °C | 31.1 °C | 102.87 mm |
| August | 18.4 °C | 30.8 °C | 89.15 mm |
| September | 14.1 °C | 26.9 °C | 92.2 mm |
| October | 7.6 °C | 20.7 °C | 92.96 mm |
| November | 2.1 °C | 13.8 °C | 105.92 mm |
| December | -2.7 °C | 7.8 °C | 81.79 mm |
| Annual | 7.5 °C | 19.4 °C | 1197.1 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 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 | Cfa - Humid Subtropical Climate |