The temperature on May 9, 1911 was between 7.7 °C and 22.1 °C and averaged 15.8 °C. There was 12.2 hours of sunshine (80%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the northeast. Source: KNMI
April 29 » Tsinghua University, one of mainland China's leading universities, is founded.
June 16 » IBM founded as the Computing-Tabulating-Recording Company in Endicott, New York.
June 22 » George V and Mary of Teck are crowned King and Queen of the United Kingdom of Great Britain and Ireland.
August 14 » United States Senate leaders agree to rotate the office of President pro tempore of the Senate among leading candidates to fill the vacancy left by William P. Frye's death.
September 18 » Russian Premier Pyotr Stolypin is shot at the Kiev Opera House.
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: Arthur Storm, "Family tree Storm", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-storm/I3437.php : accessed February 27, 2026), "Maartje de Greef (± 1859-1911)".
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