Phelps City, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.1 °C (low) to 17.5 °C (high). Annual precipitation averages 874.3 Millimeters. Phelps City is located in USDA Plant Hardiness Zone 5b. 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 | -9.6 °C | 1.4 °C | 19.05 mm |
| February | -7.2 °C | 4.4 °C | 29.21 mm |
| March | -1.4 °C | 11.7 °C | 50.29 mm |
| April | 4.7 °C | 18.1 °C | 84.07 mm |
| May | 11.4 °C | 23.8 °C | 135.64 mm |
| June | 17.2 °C | 28.8 °C | 122.68 mm |
| July | 19.2 °C | 30.8 °C | 114.81 mm |
| August | 17.6 °C | 29.9 °C | 95 mm |
| September | 12.4 °C | 26.6 °C | 82.3 mm |
| October | 5.6 °C | 19.8 °C | 66.04 mm |
| November | -1.4 °C | 10.9 °C | 44.45 mm |
| December | -6.8 °C | 4 °C | 30.73 mm |
| Annual | 5.1 °C | 17.5 °C | 874.27 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°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 |