For most visitors, the best time to go to Thornton is during the summer months, from June to August, or in the autumn, from September to October.Summer in Thornton offers warm, pleasant weather, ideal for outdoor activities. The average daily temperature hovers around 25°C, making it superb for exploring the White Mountain National Forest, which borders the town. You'll find plenty of opportunities for hiking, kayaking, and enjoying the natural surroundings. It's a great time for families looking to make the most of the long daylight hours and the many accessible trails.Autumn is another excellent choice, particularly for couples and those who appreciate scenic beauty. From mid-September to mid-October, the region transforms with spectacular fall foliage. The cooler temperatures, averaging around 15°C, are comfortable for leisurely drives through the Kancamagus Highway, which is renowned for its autumn colours.