Rock Port, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.9 °F (low) to 62.9 °F (high). Annual precipitation averages 35 Inches. 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 | 14.4 °F | 34.1 °F | 0.73 in. |
| February | 18.7 °F | 39.6 °F | 1.18 in. |
| March | 28.9 °F | 52.2 °F | 1.99 in. |
| April | 40.0 °F | 63.9 °F | 3.41 in. |
| May | 52.1 °F | 74.2 °F | 5.4 in. |
| June | 62.5 °F | 83.3 °F | 4.93 in. |
| July | 66.2 °F | 86.9 °F | 4.6 in. |
| August | 63.3 °F | 85.3 °F | 3.89 in. |
| September | 54.0 °F | 79.2 °F | 3.28 in. |
| October | 41.5 °F | 66.7 °F | 2.62 in. |
| November | 29.2 °F | 51.2 °F | 1.74 in. |
| December | 19.4 °F | 38.6 °F | 1.21 in. |
| Annual | 40.9 °F | 62.9 °F | 34.98 in. |
| 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 : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |