The temperature on May 17, 1911 was between 11.6 °C and 18.1 °C and averaged 14.7 °C. There was 8.1 hours of sunshine (51%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the northeast. Source: KNMI
April 27 » Following the resignation and death of William P. Frye, a compromise is reached to rotate the office of President pro tempore of the United States Senate.
April 29 » Tsinghua University, one of mainland China's leading universities, is founded.
May 31 » The President of Mexico Porfirio Díaz flees the country during the Mexican Revolution.
August 21 » The Mona Lisa is stolen by Vincenzo Peruggia, a Louvre employee.
September 20 » The White Star Line's RMSOlympic collides with the British warship HMSHawke.
November 17 » Omega Psi Phi fraternity was founded on the campus of Howard University in Washington, D.C.
When copying data from this family tree, please include a reference to the origin: Harry Westerman, "Family tree Westerman", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-westerman/I2007.php : accessed January 6, 2026), "Adam Ammersken".
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