BURLINGTON, Vt. (WCAX) - As the climatological peak of summer heat approaches in the coming weeks, you’ve likely also noticed the humidity being a bit more persist and muggy. That’s because in early-to-mid July is our average most humid time of the year. Average Dew Point in Burlington, Vermont We obviously can get uncomfortably muggy in June and even August, but this timeframe is when we are most consistently humid.