Aram Boghosian for The Boston Globe

A sign at the summit of Mount Washington informs viewers that they are standing 6,288 feet above sea level.

Aram Boghosian for The Boston Globe

Mount Washington Observatory Winter EduTrip participants Steve Roberts (left) and Sonya Roberts climbed to the summit while exploring during their visit.

Aram Boghosian for The Boston Globe

Mount Washington Observatory weather observers checked on the weather instruments at the top of the observatory on the summit of Mount Washington.

Aram Boghosian for The Boston Globe

The view from the Mount Washington Auto Road.

Aram Boghosian for The Boston Globe

Rime ice grows on the side of the Mount Washington Observatory at the summit of Mount Washington.

Aram Boghosian for The Boston Globe

Volunteers Barbara Althen ( back center left), and Bill Ofsiany (center right) served dinner to participants of a Winter EduTrip at the Mount Washington Observatory on the summit of Mount Washington.

Aram Boghosian for The Boston Globe

Mount Washington Observatory Winter EduTrip participants (from left) Sonya Roberts, Matt Buck, Steve Roberts, and Len Weiss received instruction on different weather instruments from weather observer Brian Fitzgerald.

Aram Boghosian for The Boston Globe

Mount Washington Observatory summit intern Mike Dorfman,23 ,checked weather maps while working at his station.

Aram Boghosian for The Boston Globe

Mount Washington Observatory Winter EduTrip participant Matt Buck,35, a fifth- and sixth-grade science teacher, put on his gloves before exploring the summit of Mount Washington during the night of his visit.

Aram Boghosian for The Boston Globe

Mount Washington Observatory meteorologist Mike Carmon checked the snow levels in the precipitation can during his overnight shift at the summit.

Aram Boghosian for The Boston Globe

Mark Parsons (left) and Matt Buck explored the summit of Mount Washington during the night of their visit.

Aram Boghosian for The Boston Globe

Mark Parsons explored the summit of Mount Washington during the night of his visit.

Aram Boghosian for The Boston Globe

Winter EduTrip participants explored the summit of Mount Washington during the night of their visit.

Aram Boghosian for The Boston Globe

Mark Parsons, 37, read a plaque dedicated to the New England Chapter of 10th Mountain Division from WWII at the summit of Mount Washington.

Aram Boghosian for The Boston Globe

Winter EduTrip participant Mark Parsons, 37, entered the observatory after exploring the summit of Mount Washington.