According to NOAA’s Northeast Regional Climate Center (NRCC), September, so far, has been colder than normal for much of the northeastern United States. The center, located at Cornell University, within the University’s atmospheric science department, found that temperatures generally ranged from 6°F below normal to normal, with the coldest areas being in West Virginia, Maryland, Pennsylvania, and New York.
In Huntington, West Virginia for example, the temperatures from September 1st through the 15th average 6°F below normal. Temperatures for the same time period from Erie and Pittsburgh, Pennsylvania averaged 5°F and 4.8°F below normal, respectively.
There were a few areas that have been above normal so far this September, mainly across eastern sections of Maine, and isolated sections of Vermont and Massachusetts.
You can read more about the Northeast September chill in the NRCC’s blog post here.