Medway, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.2 °C (low) to 11.4 °C (high). Annual precipitation averages 1160 Millimeters. 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 | -15.6 °C | -4.2 °C | 88.9 mm |
| February | -14.8 °C | -2.3 °C | 71.12 mm |
| March | -8.6 °C | 2.9 °C | 90.17 mm |
| April | -1.6 °C | 10.1 °C | 93.98 mm |
| May | 4.8 °C | 17.8 °C | 93.73 mm |
| June | 10.3 °C | 22.7 °C | 106.93 mm |
| July | 13.6 °C | 25.6 °C | 93.22 mm |
| August | 12.5 °C | 25.2 °C | 91.95 mm |
| September | 8.2 °C | 20.8 °C | 90.68 mm |
| October | 2.1 °C | 13 °C | 124.21 mm |
| November | -3.2 °C | 5.8 °C | 105.41 mm |
| December | -10.1 °C | -0.6 °C | 109.73 mm |
| Annual | -0.2 °C | 11.4 °C | 1160.03 mm |
| 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 : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |