The average temperature on March 20, 1911 was 5.0 °C. There was 9.9 hours of sunshine (82%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the east. Source: KNMI
February 18 » The first official flight with airmail takes place from Allahabad, United Provinces, British India (now India), when Henri Pequet, a 23-year-old pilot, delivers 6,500 letters to Naini, about 10 kilometres (6.2mi) away.
April 8 » Dutch physicist Heike Kamerlingh Onnes discovers superconductivity.
June 16 » IBM founded as the Computing-Tabulating-Recording Company in Endicott, New York.
June 22 » Mexican Revolution: Government forces bring an end to the Magonista rebellion of 1911 in the Second Battle of Tijuana.
August 1 » Harriet Quimby takes her pilot's test and becomes the first U.S. woman to earn an Aero Club of America aviator's certificate.
September 24 » His Majesty's Airship No. 1, Britain's first rigid airship, is wrecked by strong winds before her maiden flight at Barrow-in-Furness.
When copying data from this family tree, please include a reference to the origin: Hans Weening, "Family tree Weening", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-weening/I208384.php : accessed December 28, 2025), "Roelf Hoving (1911-)".
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