Grand Falls Plaza, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.3 °C (low) to 20.4 °C (high). Annual precipitation averages 1165.6 Millimeters. Grand Falls Plaza 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 | -4.2 °C | 6.9 °C | 52.58 mm |
| February | -2.3 °C | 9.8 °C | 54.61 mm |
| March | 2.5 °C | 15.1 °C | 88.14 mm |
| April | 7.7 °C | 20.3 °C | 129.79 mm |
| May | 13.3 °C | 24.8 °C | 173.99 mm |
| June | 18.4 °C | 29.7 °C | 124.46 mm |
| July | 20.7 °C | 32.3 °C | 88.9 mm |
| August | 19.6 °C | 32.2 °C | 91.69 mm |
| September | 14.9 °C | 27.9 °C | 107.7 mm |
| October | 8.4 °C | 21.7 °C | 101.09 mm |
| November | 2.4 °C | 14.8 °C | 86.87 mm |
| December | -2.3 °C | 8.8 °C | 65.79 mm |
| Annual | 8.3 °C | 20.4 °C | 1165.61 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 | Cfa - Humid Subtropical Climate |