The temperature on December 23, 1963 was between -9.0 °C and -3.6 °C and averaged -6.9 °C. There was 6.6 hours of sunshine (85%). The average windspeed was 2 Bft (weak wind) and was prevailing from the east-southeast. Source: KNMI
May 25 » The Organisation of African Unity is established in Addis Ababa, Ethiopia.
June 17 » The United States Supreme Court rules 8–1 in Abington School District v. Schempp against requiring the reciting of Bible verses and the Lord's Prayer in public schools.
August 5 » Cold War: The United States, the United Kingdom, and the Soviet Union sign the Partial Nuclear Test Ban Treaty.
August 22 » X-15 Flight 91 reaches the highest altitude of the X-15 program (107.96km (67.08mi) (354,200 feet)).
August 31 » Crown Colony of North Borneo (now Sabah) achieves self governance.
November 29 » Trans-Canada Air Lines Flight 831 crashes shortly after takeoff from Montreal-Dorval International Airport, killing all 118 people on board.
When copying data from this family tree, please include a reference to the origin: Michael Jacobs, "Family tree Jacobs", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-michael-jacobs/I63293.php : accessed February 2, 2026), "Wilma Wieldraaier (1963-)".
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