That’s what it felt like at Mount Washington amid Arctic blastMount Washington is famous for its extreme weather conditions, but the latest Arctic outbreak has crushed a long-standing record at the summit of the mountain. (AccuWeather)Boston dipped to 10 degrees below zero Fahrenheit on Saturday morning with an AccuWeather RealFeel® Temperature of 45 degrees below zero at one point. Mount Washington is covered in snow in this Wednesday, Nov. 13, 2013 file photo taken from Bartlett, N.H. Extreme Mount Washington sits on the top of the Northeast’s highest peak, in New Hampshire. Mount Washington now holds the record for the lowest wind chill ever recorded in the United State at 109 degrees below zero.