It noted that records going back to Jan. 22, 1885 include a -50 degree reading.
"This is also the NH state record for the coldest temperature," it said.
AUSTIN MAYOR APOLOGIZES FOR CONTINUED BLACKOUTS FOLLOWING FREAK WINTER STORM
Mount Washington Observatory weather observers check on the weather instruments at the top of the observatory on the summit of Mount Washington. (Aram Boghosian for The Boston Globe via Getty Images)
Mount Washington is the highest peak in the northeastern U.S., with an elevation of 6,288 feet.
Earlier in day the Mount Washington Observatory tweeted that the daily record low of -32 degrees Fahrenheit, set in 1963, had been broken.
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 via Getty Images)
The observatory's website showed Saturday morning that the temperature was -31 degrees, with a wind chill temperature of -83 degrees. It said that winds would remain elevated on Saturday morning. Temperatures were expected to moderate by Saturday afternoon, reaching -15 by sunset and climbing overnight. Wind speeds would drop to 50 to 70 miles per hour by Sunday morning.
Rime ice grows on the side of the Mount Washington Observatory at the summit of Mount Washington. (Aram Boghosian for The Boston Globe via Getty Images)
Fox Weather reported that, due to the harsh cold conditions there, a wind chill warning would remain in effect until 1 a.m. EST on Sunday.