Planning for the weather is a good way to make your trip to Chamcook relaxing and enjoyable, especially when you’re splurging. The hottest months are usually July and August with an average temp of 63°F, while the coldest months are January and February with an average of 25°F. The snowiest months in Chamcook are January, February, December, and March, with each month seeing an average of 15 inches of snowfall.