Jamaica, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.2 °C (low) to 13.4 °C (high). Annual precipitation averages 1247.6 Millimeters. Jamaica is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -12.1 °C | -1.2 °C | 97.03 mm |
| February | -11.5 °C | 0.6 °C | 77.72 mm |
| March | -6.7 °C | 5.1 °C | 105.41 mm |
| April | -0.2 °C | 12.4 °C | 108.46 mm |
| May | 6.2 °C | 19.6 °C | 103.63 mm |
| June | 11.3 °C | 24.3 °C | 115.06 mm |
| July | 14 °C | 27.1 °C | 105.41 mm |
| August | 12.8 °C | 26.2 °C | 93.47 mm |
| September | 8.6 °C | 22.2 °C | 93.73 mm |
| October | 2.4 °C | 14.6 °C | 132.84 mm |
| November | -2.5 °C | 7.9 °C | 101.09 mm |
| December | -7.7 °C | 1.7 °C | 113.79 mm |
| Annual | 1.2 °C | 13.4 °C | 1247.64 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |