Wales, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.5 °C (low) to 13.5 °C (high). Annual precipitation averages 1292.9 Millimeters. 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 | -7.9 °C | 0.2 °C | 97.03 mm |
| February | -7.3 °C | 1.4 °C | 83.57 mm |
| March | -3.3 °C | 5.7 °C | 108.71 mm |
| April | 2.7 °C | 12.8 °C | 111.76 mm |
| May | 8.6 °C | 18.9 °C | 95.25 mm |
| June | 13.8 °C | 23.6 °C | 113.79 mm |
| July | 16.8 °C | 26.2 °C | 105.41 mm |
| August | 16.2 °C | 25.2 °C | 116.84 mm |
| September | 12.3 °C | 21.3 °C | 116.08 mm |
| October | 5.8 °C | 14.7 °C | 126.49 mm |
| November | 0.7 °C | 8.8 °C | 101.85 mm |
| December | -4.3 °C | 3.1 °C | 116.08 mm |
| Annual | 4.5 °C | 13.5 °C | 1292.86 mm |
| 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 : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |