Generally warm and humid in the summer. Often windy and wet in Fall and Spring. Generally cold in winter, with snow possible from November through March. Layered clothing is recommended and comfortable shoes recommended for walking on gravel.
Maine ocean islands provide the only nesting sites for Atlantic puffins in the United States. Eastern Egg Rock in the midcoast region, Seal Island and Matinicus Rock at the mouth of Penobscot Bay, and Machias Seal Island and Petit Manan Island off the downeast coast provide habitat for more than 4,000 puffins each summer.