Jamestown, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.4 °F (low) to 56.4 °F (high). Annual precipitation averages 45.9 Inches. Jamestown is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.2 °F | 31.2 °F | 3.63 in. |
| February | 15.5 °F | 33.7 °F | 2.58 in. |
| March | 22.4 °F | 42.5 °F | 3.14 in. |
| April | 33.1 °F | 55.5 °F | 3.92 in. |
| May | 44.0 °F | 67.5 °F | 3.94 in. |
| June | 53.0 °F | 75.4 °F | 4.4 in. |
| July | 56.9 °F | 79.4 °F | 4.46 in. |
| August | 55.7 °F | 78.0 °F | 4.0 in. |
| September | 49.3 °F | 71.7 °F | 3.9 in. |
| October | 38.9 °F | 59.1 °F | 4.24 in. |
| November | 30.1 °F | 46.8 °F | 3.68 in. |
| December | 22.5 °F | 36.2 °F | 3.97 in. |
| Annual | 36.4 °F | 56.4 °F | 45.86 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 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 | Dfb - Humid Continental Mild Summer, Wet All Year |