The temperature on March 23, 1909 was between 2.3 °C and 9.5 °C and averaged 5.4 °C. There was 4.4 hours of sunshine (36%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the north-northeast. Source: KNMI
January 16 » Ernest Shackleton's expedition finds the magnetic South Pole.
February 20 » Publication of the Futurist Manifesto in the French journal Le Figaro.
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.
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.
April 6 » Robert Peary and Matthew Henson become the first people to reach the North Pole; Peary's claim has been disputed because of failings in his navigational ability.
August 19 » The first automobile race at the Indianapolis Motor Speedway.
Day of marriage May 18, 1928
The temperature on May 18, 1928 was between 3.2 °C and 12.3 °C and averaged 7.6 °C. There was 1.0 mm of rain. There was 3.7 hours of sunshine (23%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the east-southeast. Source: KNMI
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/I11456.php : accessed December 29, 2025), "Klaas Jacob Jonker (1909-)".
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