The temperature on November 21, 1909 was between 0.4 °C and 7.0 °C and averaged 3.6 °C. There was 3.3 mm of rain. There was 3.4 hours of sunshine (40%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the northwest. Source: KNMI
January 16 » Ernest Shackleton's expedition finds the magnetic South Pole.
March 10 » By signing the Anglo-Siamese Treaty of 1909, Thailand relinquishes its sovereignty over the Malay states of Kedah, Kelantan, Perlis and Terengganu, which become British protectorates.
May 31 » The National Negro Committee, forerunner to the National Association for the Advancement of Colored People (NAACP), convenes for the first time.
August 30 » Burgess Shale fossils are discovered by Charles Doolittle Walcott.
October 26 » An Jung-geun assassinates Japan's Resident-General of Korea.
December 4 » In Canadian football, the First Grey Cup game is played. The University of Toronto Varsity Blues defeat the Toronto Parkdale Canoe Club, 26–6.
Day of marriage April 7, 1934
The temperature on April 7, 1934 was between 6.2 °C and 14.4 °C and averaged 9.3 °C. There was 0.4 mm of rain during 0.6 hours. There was 2.5 hours of sunshine (19%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south-southwest. Source: KNMI
January 1 » Alcatraz Island in San Francisco Bay becomes a United States federal prison.
April 12 » The strongest surface wind gust in the world at the time of 231mph, is measured on the summit of Mount Washington, New Hampshire. It has since been surpassed.
July 2 » The Night of the Long Knives ends with the death of Ernst Röhm.
August 19 » The first All-American Soap Box Derby is held in Dayton, Ohio.
October 22 » In East Liverpool, Ohio, FBI agents shoot and kill notorious bank robber Pretty Boy Floyd.
November 11 » The Shrine of Remembrance in Melbourne, Australia is opened.
When copying data from this family tree, please include a reference to the origin: Joop Klavers, "Family tree Klavers", database, Genealogy Online (https://www.genealogieonline.nl/stamboom_klavers/I320271.php : accessed February 2, 2026), "Gerhardus Herman de Groot (1909-)".
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