Medway, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 39.3 °F (low) to 60.4 °F (high). Annual precipitation averages 49.4 Inches. Medway is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 17.4 °F | 36.5 °F | 3.92 in. |
| February | 19.0 °F | 39.1 °F | 3.38 in. |
| March | 26.4 °F | 46.4 °F | 4.57 in. |
| April | 36.4 °F | 58.8 °F | 4.47 in. |
| May | 46.4 °F | 69.1 °F | 3.51 in. |
| June | 55.7 °F | 77.6 °F | 4.37 in. |
| July | 61.6 °F | 83.2 °F | 3.54 in. |
| August | 60.1 °F | 81.9 °F | 3.97 in. |
| September | 52.4 °F | 75.1 °F | 3.96 in. |
| October | 40.9 °F | 63.1 °F | 4.92 in. |
| November | 31.8 °F | 52.1 °F | 4.01 in. |
| December | 23.6 °F | 41.9 °F | 4.77 in. |
| Annual | 39.3 °F | 60.4 °F | 49.39 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 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 | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |