Rea, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.4 °C (low) to 17 °C (high). Annual precipitation averages 961.6 Millimeters. Rea is located in USDA Plant Hardiness Zone 6a. 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 | -9.2 °C | 1.4 °C | 22.86 mm |
| February | -6.8 °C | 4.3 °C | 32.51 mm |
| March | -1.2 °C | 11.2 °C | 58.93 mm |
| April | 4.7 °C | 17.3 °C | 94.74 mm |
| May | 11.2 °C | 22.9 °C | 134.62 mm |
| June | 16.6 °C | 28 °C | 132.84 mm |
| July | 19.1 °C | 30.3 °C | 125.73 mm |
| August | 17.8 °C | 29.5 °C | 101.6 mm |
| September | 12.8 °C | 25.6 °C | 93.47 mm |
| October | 6.1 °C | 18.8 °C | 78.99 mm |
| November | -0.4 °C | 11 °C | 48.01 mm |
| December | -5.9 °C | 3.8 °C | 37.34 mm |
| Annual | 5.4 °C | 17 °C | 961.64 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |