The temperature on July 6, 1911 was between 9.9 °C and 25.7 °C and averaged 19.1 °C. There was 13.7 hours of sunshine (83%). The average windspeed was 2 Bft (weak wind) and was prevailing from the north-northeast. Source: KNMI
April 8 » Dutch physicist Heike Kamerlingh Onnes discovers superconductivity.
June 16 » IBM founded as the Computing-Tabulating-Recording Company in Endicott, New York.
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.
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.
August 21 » The Mona Lisa is stolen by Vincenzo Peruggia, a Louvre employee.
November 17 » Omega Psi Phi fraternity was founded on the campus of Howard University in Washington, D.C.
Day of marriage December 18, 1935
The temperature on December 18, 1935 was between -1.1 °C and 4.0 °C and averaged 1.3 °C. There was 1.1 mm of rain during 1.0 hours. There was 2.9 hours of sunshine (37%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west. Source: KNMI
April 1 » India's central banking institution, The Reserve Bank of India, is formed.
May 29 » First flight of the Messerschmitt Bf 109 fighter aeroplane.
June 12 » A ceasefire is negotiated between Bolivia and Paraguay, ending the Chaco War.
July 5 » The National Labor Relations Act, which governs labor relations in the United States, is signed into law by President Franklin D. Roosevelt.
November 22 » The China Clipper inaugurates the first commercial transpacific air service, connecting Alameda, California with Manila.
December 17 » First flight of the Douglas DC-3.
Day of death September 30, 1970
The temperature on September 30, 1970 was between 10.4 °C and 16.2 °C and averaged 13.2 °C. There was 8.5 mm of rain during 5.0 hours. There was -0.1 hours of sunshine (0%). The heavily clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the southwest. Source: KNMI
March 18 » Lon Nol ousts Prince Norodom Sihanouk of Cambodia.
April 8 » Bahr El-Baqar primary school bombing: Israeli bombers strike an Egyptian school. Forty-six children are killed.
May 31 » The 7.9 Mw Ancash earthquake shakes Peru with a maximum Mercalli intensity of VIII (Severe) and a landslide buries the town of Yungay, Peru. Between 66,794–70,000 were killed and 50,000 were injured.
August 17 » Venera program: Venera 7 launched. It will later become the first spacecraft to successfully transmit data from the surface of another planet (Venus).
August 23 » Organized by Mexican American labor union leader César Chávez, the Salad Bowl strike, the largest farm worker strike in U.S. history, begins.
December 2 » The United States Environmental Protection Agency begins operations.
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/I167796.php : accessed October 26, 2026), "Tiemen de Vries (1911-1970)".
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