The temperature on September 12, 1911 was between 9.0 °C and 27.1 °C and averaged 17.7 °C. There was 10.8 hours of sunshine (84%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south east. Source: KNMI
April 29 » Tsinghua University, one of mainland China's leading universities, is founded.
August 21 » The Mona Lisa is stolen by Vincenzo Peruggia, a Louvre employee.
September 23 » Pilot Earle Ovington makes the first official airmail delivery in America under the authority of the United States Post Office Department
October 5 » The Kowloon–Canton Railway commences service.
November 17 » Omega Psi Phi fraternity was founded on the campus of Howard University in Washington, D.C.
December 29 » Mongolia gains independence from the Qing dynasty, enthroning 8th Jebtsundamba Khutughtu as Khagan of Mongolia.
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/I119240.php : accessed December 29, 2025), "Levenloos geborene".
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