Jamaica, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 38.3 °F (low) to 59.3 °F (high). Annual precipitation averages 35.7 Inches. Jamaica is located in USDA Plant Hardiness Zone 5a. 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 | 10.8 °F | 28.8 °F | 0.89 in. |
| February | 14.7 °F | 33.4 °F | 1.21 in. |
| March | 26.2 °F | 46.7 °F | 2.19 in. |
| April | 37.3 °F | 60.8 °F | 3.79 in. |
| May | 49.7 °F | 71.5 °F | 4.81 in. |
| June | 60.1 °F | 81.0 °F | 5.43 in. |
| July | 63.7 °F | 84.6 °F | 4.05 in. |
| August | 60.9 °F | 82.3 °F | 4.11 in. |
| September | 52.0 °F | 76.8 °F | 3.34 in. |
| October | 39.7 °F | 63.7 °F | 2.78 in. |
| November | 27.3 °F | 47.5 °F | 1.71 in. |
| December | 16.8 °F | 34.1 °F | 1.35 in. |
| Annual | 38.3 °F | 59.3 °F | 35.66 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 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |