Rock Port, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.9 °C (low) to 17.2 °C (high). Annual precipitation averages 888.5 Millimeters. Rock Port 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 | -9.8 °C | 1.2 °C | 18.54 mm |
| February | -7.4 °C | 4.2 °C | 29.97 mm |
| March | -1.7 °C | 11.2 °C | 50.55 mm |
| April | 4.4 °C | 17.7 °C | 86.61 mm |
| May | 11.2 °C | 23.4 °C | 137.16 mm |
| June | 16.9 °C | 28.5 °C | 125.22 mm |
| July | 19 °C | 30.5 °C | 116.84 mm |
| August | 17.4 °C | 29.6 °C | 98.81 mm |
| September | 12.2 °C | 26.2 °C | 83.31 mm |
| October | 5.3 °C | 19.3 °C | 66.55 mm |
| November | -1.6 °C | 10.7 °C | 44.2 mm |
| December | -7 °C | 3.7 °C | 30.73 mm |
| Annual | 4.9 °C | 17.2 °C | 888.49 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 |