East Mountain stands within the watershed of the Connecticut River, which drains into Long Island Sound in Connecticut.
The north side of East Mountain drains into Madison Brook, thence into Paul Stream, and the Connecticut River.
The southeast side of East Mtn. drains into Stony Brook and Fitch Brook, thence into Granby Stream, and into Paul Stream.
The southwest side of East Mtn. drains into the East Branch of the Moose River, and thence into the Passumpsic River, another tributary of the Connecticut.
East Mountain is the site of the former USAF North Concord Air Force Station, a ground-based radar facility of the US military. Built in 1955, its name was changed to Lyndonville Air Force Station in 1962; it was closed in 1963.[2]
The North Concord AFS reported an unidentified flying object (UFO) sighting in 1961 — a couple hours before the reported abduction of Barney and Betty Hill. The US military sighting lasted 18 minutes.[3]
Climate
Climate data for East Mountain (VT) 44.6656 N, 71.7758 W, Elevation: 3,219 ft (981 m) (1991–2020 normals)
^"PRISM Climate Group, Oregon State University". PRISM Climate Group, Oregon State University. Retrieved October 26, 2023. To find the table data on the PRISM website, start by clicking Coordinates (under Location); copy Latitude and Longitude figures from top of table; click Zoom to location; click Precipitation, Minimum temp, Mean temp, Maximum temp; click 30-year normals, 1991-2020; click 800m; click Retrieve Time Series button.