Jamesport, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.7 °F (low) to 62.4 °F (high). Annual precipitation averages 40 Inches. Jamesport 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 | 16.1 °F | 34.2 °F | 1.12 in. |
| February | 19.7 °F | 39.6 °F | 1.61 in. |
| March | 30.2 °F | 51.7 °F | 2.45 in. |
| April | 40.4 °F | 62.9 °F | 3.79 in. |
| May | 52.0 °F | 72.9 °F | 5.61 in. |
| June | 61.9 °F | 82.3 °F | 5.26 in. |
| July | 65.9 °F | 86.5 °F | 4.58 in. |
| August | 63.7 °F | 85.0 °F | 4.35 in. |
| September | 54.9 °F | 77.7 °F | 4.22 in. |
| October | 43.0 °F | 65.4 °F | 3.21 in. |
| November | 31.5 °F | 51.6 °F | 2.12 in. |
| December | 21.3 °F | 39.0 °F | 1.64 in. |
| Annual | 41.7 °F | 62.4 °F | 39.96 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°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 |