What is New England average ACT score?

There isn't a single, officially published "average ACT score for New England." The ACT doesn't release average scores broken down by that specific region. To get an idea, you would need to look at average ACT scores for each individual New England state (Maine, Vermont, New Hampshire, Massachusetts, Rhode Island, Connecticut) and then calculate a weighted average based on the population of each state taking the ACT. Even then, this would be an approximation and likely vary from year to year.