The climate in Eastham is relatively mild, with warm summers and cold winters. The area is characterized by its sandy, well-drained soil, which makes it ideal for growing cranberries. The town is also home to several important waterways, including the Atlantic Ocean, Cape Cod Bay, and several freshwater ponds. These waterways provide ample opportunities for outdoor recreation, including swimming, boating, fishing, and kayaking. The town is also home to several conservation areas and hiking trails, making it a popular destination for nature lovers. Overall, Eastham offers a unique combination of natural beauty, rich history, and outdoor recreation opportunities.
Eastham receives approximately 1125mm of rain per year, with humidity levels near 79% and air temperatures averaging around 10°C. Eastham has a plant hardyness factor of 7, meaning plants and agriculture in this region tend to thrive during the non-winter months.