Medway, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 31.6 °F (low) to 52.5 °F (high). Annual precipitation averages 45.7 Inches. Medway is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.9 °F | 24.4 °F | 3.5 in. |
| February | 5.3 °F | 27.8 °F | 2.8 in. |
| March | 16.5 °F | 37.3 °F | 3.55 in. |
| April | 29.2 °F | 50.1 °F | 3.7 in. |
| May | 40.6 °F | 64.0 °F | 3.69 in. |
| June | 50.5 °F | 72.8 °F | 4.21 in. |
| July | 56.5 °F | 78.1 °F | 3.67 in. |
| August | 54.5 °F | 77.3 °F | 3.62 in. |
| September | 46.7 °F | 69.5 °F | 3.57 in. |
| October | 35.7 °F | 55.4 °F | 4.89 in. |
| November | 26.2 °F | 42.5 °F | 4.15 in. |
| December | 13.8 °F | 30.9 °F | 4.32 in. |
| Annual | 31.6 °F | 52.5 °F | 45.67 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |