The temperature on April 17, 1911 was between 0.2 °C and 16.3 °C and averaged 9.9 °C. There was 7.9 hours of sunshine (56%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south-southwest. Source: KNMI
May 15 » In Standard Oil Co. of New Jersey v. United States, the United States Supreme Court declares Standard Oil to be an "unreasonable" monopoly under the Sherman Antitrust Act and orders the company to be broken up.
July 24 » Hiram Bingham III re-discovers Machu Picchu, "the Lost City of the Incas".
November 3 » Chevrolet officially enters the automobile market in competition with the Ford Model T.
November 11 » Many cities in the Midwestern United States break their record highs and lows on the same day as a strong cold front rolls through.
November 17 » Omega Psi Phi fraternity was founded on the campus of Howard University in Washington, D.C.
December 27 » "Jana Gana Mana", the national anthem of India, is first sung in the Calcutta Session of the Indian National Congress.
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/I167720.php : accessed October 23, 2026), "Hielkje Penninga (1911-)".
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