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National Big Wind Day

Celebrated on 04/12/2026

Quick Fact

National Big Wind Day commemorates the strongest surface wind gust ever recorded on Earth, which occurred on April 12, 1934, at the Mount Washington Observatory in New Hampshire. The wind speed reached an astonishing 231 miles per hour (372 kilometers per hour), a record that still stands today.

Origins and Establishment of National Big Wind Day

National Big Wind Day was established to honor the record-breaking wind gust measured at the Mount Washington Observatory on April 12, 1934. The observatory, founded in 1932, was staffed by a small team of scientists studying weather conditions at the summit. On that day, a powerful storm system produced sustained winds exceeding 200 mph, and the peak gust of 231 mph was recorded using a heated anemometer. The event gained national attention and was later adopted as an unofficial holiday by weather enthusiasts and the observatory's supporters.

Evolution and Modern Commemoration

Over the years, National Big Wind Day has evolved from a local observance into a niche celebration among meteorology fans and history buffs. The Mount Washington Observatory hosts special events, including live webcasts, educational programs, and social media campaigns highlighting the historic gust. While not an official federal holiday, it is recognized by weather organizations and serves as a reminder of extreme natural phenomena. Enthusiasts often mark the day by sharing facts about wind records or visiting the observatory.

Facts & General Observations

  • The 231 mph gust remains the highest surface wind speed ever directly measured, though higher speeds have been estimated in tornadoes (e.g., 302 mph during the 1999 Bridge Creek–Moore tornado).
  • Mount Washington's extreme weather is due to its location at the convergence of three storm tracks and its 6,288-foot elevation, creating wind speeds comparable to those on Mount Everest.
  • The observatory staff who recorded the gust endured temperatures of -2°F and had to clear ice from the anemometer every 30 minutes to ensure accurate readings.

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