New Hampshire held the record for the world's highest ground-point level wind speed from 1934 to 2010, the year it was beaten by Barrow Island, Australia. On Apr. 12, 1934, the state's Mount Washington Observatory recorded a ground level wind speed of 231 miles per hour.
In 1999, weather watchers used the Doppler method to record ground-point level wind speeds of between 302 and 318 miles per hour, but those results are not considered official by the World Record Academy, and this allows New Hampshire to remain in second place. The Mount Washington Observatory used a heated anemometer for the measurements, a device that the U.S. National Weather Bureau later confirmed as accurate.