In this Tuesday, March 10, 2015 photo, rime ice extends horizontally from a metal pole at the summit of Mt. Washington, in New Hampshire. Rime ice forms in the direction of the wind driven fog that often blows across the summit at hurricane force. (Photo by Robert F. Bukaty/AP Photo)

In this Tuesday, March 10, 2015 photo, a scientist knocks rime ice off the surface of weather instruments on top of the Mount Washington Observatory at the summit of Mount Washington in New Hampshire. (Photo by Robert F. Bukaty/AP Photo)

In this Tuesday, March 10, 2015 photo, Gary Gustafson, 58, leads Linda Dewey, 54, up an icy trail on the summit cone of Mount Washington in New Hampshire. The hikers waited about four weeks for a calm day before attempting the mountain that is notorious for its erratic weather. (Photo by Robert F. Bukaty/AP Photo)

In this Tuesday, March 10, 2015 photo, rime ice extends horizontally from a metal pole at the summit of 6,288-foot Mt. Washington, in New Hampshire. (Photo by Robert F. Bukaty/AP Photo)

In this Tuesday, March 10, 2015 photo, Nathan Iannuccillo, 23 of Smithfield, R.I., takes a lunch break after climbing more than 4 miles to reach the summit of Mount Washington, New Hampshire. Sharp steel crampons give him traction on the icy trails. (Photo by Robert F. Bukaty/AP Photo)

In this Tuesday, March 10, 2015 photo, Ryan Eyestone, 31, of Portland, Maine, makes a photographs near the weather instrument tower of the Mount Washington Observatory on the summit of Mount Washington in New Hampshire. (Photo by Robert F. Bukaty/AP Photo)

In this Tuesday, March 10, 2015 photo, a hiker leaves the summit of Mount Washington, New Hampshire. The snow-covered peaks of the northern presidential range can be seen in the distance. They are, from left, Mounts Clay, Jefferson, Adams and Madison. (Photo by Robert F. Bukaty/AP Photo)

In this Tuesday, March 10, 2015 photo, a sign marks the summit of 6,288-foot Mount Washington, New Hampshire. (Photo by Robert F. Bukaty/AP Photo)

In this Tuesday, March 10, 2015 photo, rime ice covers rocks on the summit of Mount Washington in New Hampshire. Rime ice occurs when freezing fog hits stationary objects in frigid conditions. (Photo by Robert F. Bukaty/AP Photo)