Holyoke, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 39.4 °F (low) to 59.9 °F (high). Annual precipitation averages 46.5 Inches. Holyoke 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 | 16.3 °F | 34.3 °F | 3.29 in. |
| February | 17.6 °F | 37.2 °F | 2.86 in. |
| March | 26.3 °F | 45.6 °F | 3.61 in. |
| April | 37.0 °F | 59.1 °F | 3.74 in. |
| May | 47.5 °F | 70.3 °F | 3.69 in. |
| June | 56.7 °F | 78.6 °F | 4.43 in. |
| July | 62.2 °F | 83.9 °F | 3.96 in. |
| August | 60.4 °F | 82.2 °F | 4.29 in. |
| September | 52.7 °F | 75.0 °F | 4.54 in. |
| October | 41.2 °F | 62.4 °F | 4.75 in. |
| November | 31.6 °F | 50.5 °F | 3.33 in. |
| December | 22.9 °F | 39.7 °F | 3.99 in. |
| Annual | 39.4 °F | 59.9 °F | 46.48 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 6a : -10°F to -5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |