A record wind gust of 231 miles/hour was recorded in 1934, according to http://www.mountwashington.org/about/visitor/recordwind.php
Wind speeds of this magnitude are commonly known to damage or destroy structures as well as most mechanical instruments. You would think instrument readings would be given error bars, and larger error bars if conditions are not ideal for the use of the instrument. Usually, instruments are calibrated under very controlled conditions, and one should be skeptical about the use of the instrument under conditions beyond the manufacturer's rated specifications. With weather records, though, it seems to be common just to compare the numbers and see which is a new high or new low.
This snippet from the webpage above, explains events surrounding the storm in question:
April 12, 1934...
Stephenson suited up, grabbed a wooden club and headed for the door. The intense wind created so much pressure that he was knocked to the floor as he opened the door. He struggled as he made his way to the ladder. The wind was at his back, and actually helped him maintain solid footing on the ladder. With dozens of blows, he cleared the accumulated ice from the anemometer. He dropped the club by accident, and it sailed off into the fog towards the Tip Top House.
Back inside, he flipped on the recorder and began timing the clicks from the telegraph sounder. After three tries, he verified that the wind now topped 150 mph.
This seems most incredible. Are we to really believe someone went up on a ladder, outside, in 100-150mph winds, in weather involving accumulating ice? Is this from a time when Men were Men and Giants walked the Earth?
According to Wikipedia "Wind Speed" , this record still stands as the second highest wind speed ever recorded.
Should wind records like this stand as credible?