Wales, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 40.1 °F (low) to 56.3 °F (high). Annual precipitation averages 50.9 Inches. Wales is located in USDA Plant Hardiness Zone 6b. 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 | 17.7 °F | 32.3 °F | 3.82 in. |
| February | 18.8 °F | 34.6 °F | 3.29 in. |
| March | 26.0 °F | 42.2 °F | 4.28 in. |
| April | 36.8 °F | 55.1 °F | 4.4 in. |
| May | 47.4 °F | 66.0 °F | 3.75 in. |
| June | 56.9 °F | 74.4 °F | 4.48 in. |
| July | 62.3 °F | 79.2 °F | 4.15 in. |
| August | 61.1 °F | 77.3 °F | 4.6 in. |
| September | 54.2 °F | 70.3 °F | 4.57 in. |
| October | 42.4 °F | 58.5 °F | 4.98 in. |
| November | 33.2 °F | 47.8 °F | 4.01 in. |
| December | 24.3 °F | 37.5 °F | 4.57 in. |
| Annual | 40.1 °F | 56.3 °F | 50.9 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 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |