The temperature on December 19, 1909 was between -1.3 °C and 3.6 °C and averaged 1.2 °C. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the south. Source: KNMI
January 16 » Ernest Shackleton's expedition finds the magnetic South Pole.
February 23 » The AEA Silver Dart makes the first powered flight in Canada and the British Empire.
March 23 » Theodore Roosevelt leaves New York for a post-presidency safari in Africa. The trip is sponsored by the Smithsonian Institution and National Geographic Society.
May 31 » The National Negro Committee, forerunner to the National Association for the Advancement of Colored People (NAACP), convenes for the first time.
September 23 » The novel Le Fantôme de l'Opéra (The Phantom of the Opera), by Gaston Leroux, is published as a serialization in Le Gaulois.
December 10 » Selma Lagerlöf becomes the first female writer to win the Nobel Prize in Literature.
Day of death August 11, 1971
The temperature on August 11, 1971 was between 13.7 °C and 16.1 °C and averaged 14.9 °C. There was 0.5 mm of rain during 1.0 hours. There was 1.3 hours of sunshine (9%). The heavily clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the southwest. Source: KNMI
February 20 » The United States Emergency Broadcast System is accidentally activated in an erroneous national alert.
August 15 » Bahrain gains independence from the United Kingdom.
October 12 » The 2,500 year celebration of the Persian Empire begins.
October 25 » The People's Republic of China replaces the Republic of China at the United Nations.
November 15 » Intel releases the world's first commercial single-chip microprocessor, the 4004.
December 16 » Bangladesh Liberation War and Indo-Pakistani War of 1971: The ceasefire of the Pakistan Army brings an end to both conflicts. This is commemorated annually as Victory Day in Bangladesh, and as Vijay Diwas in India.
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/I116182.php : accessed February 13, 2026), "Korneliske Helfrich (1909-1971)".
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