Jamestown, Kansas has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.1 °F (low) to 65.4 °F (high). Annual precipitation averages 29.9 Inches. Jamestown is located in USDA Plant Hardiness Zone 6b. 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 | 17.5 °F | 38.7 °F | 0.69 in. |
| February | 20.9 °F | 43.4 °F | 0.9 in. |
| March | 30.1 °F | 55.2 °F | 1.5 in. |
| April | 40.1 °F | 65.2 °F | 2.62 in. |
| May | 51.7 °F | 74.7 °F | 4.43 in. |
| June | 62.6 °F | 85.7 °F | 4.52 in. |
| July | 67.5 °F | 90.5 °F | 4.51 in. |
| August | 65.0 °F | 87.9 °F | 3.57 in. |
| September | 55.9 °F | 80.7 °F | 2.77 in. |
| October | 42.8 °F | 67.9 °F | 2.0 in. |
| November | 30.1 °F | 53.4 °F | 1.33 in. |
| December | 20.9 °F | 41.4 °F | 1.05 in. |
| Annual | 42.1 °F | 65.4 °F | 29.89 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 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |