The temperature on December 24, 1911 was between 0.3 °C and 9.0 °C and averaged 5.1 °C. There was 1.4 mm of rain. The average windspeed was 5 Bft (very strong wind) and was prevailing from the south. Source: KNMI
January 21 » The first Monte Carlo Rally takes place.
May 15 » In Standard Oil Co. of New Jersey v. United States, the United States Supreme Court declares Standard Oil to be an "unreasonable" monopoly under the Sherman Antitrust Act and orders the company to be broken up.
May 30 » At the Indianapolis Motor Speedway, the first Indianapolis 500 ends with Ray Harroun in his Marmon Wasp becoming the first winner of the 500-mile auto race.
August 21 » The Mona Lisa is stolen by Vincenzo Peruggia, a Louvre employee.
August 24 » Manuel de Arriaga is elected and sworn-in as the first President of Portugal.
September 7 » French poet Guillaume Apollinaire is arrested and put in jail on suspicion of stealing the Mona Lisa from the Louvre museum.
Day of marriage April 12, 1939
The temperature on April 12, 1939 was between 9.8 °C and 23.4 °C and averaged 16.6 °C. There was 10.2 hours of sunshine (75%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the southwest. Source: KNMI
In The Netherlands , there was from June 24, 1937 to July 25, 1939 the cabinet Colijn IV, with Dr. H. Colijn (ARP) as prime minister.
In The Netherlands , there was from July 25, 1939 to August 10, 1939 the cabinet Colijn V, with Dr. H. Colijn (ARP) as prime minister.
In The Netherlands , there was from August 10, 1939 to September 3, 1940 the cabinet De Geer II, with Jonkheer mr. D.J. de Geer (CHU) as prime minister.
February 10 » Spanish Civil War: The Nationalists conclude their conquest of Catalonia and seal the border with France.
August 2 » Albert Einstein and Leo Szilard write a letter to Franklin D. Roosevelt, urging him to begin the Manhattan Project to develop a nuclear weapon.
August 23 » World War II: Nazi Germany and the Soviet Union sign a non-aggression treaty, the Molotov–Ribbentrop Pact. In a secret addition to the pact, the Baltic states, Finland, Romania, and Poland are divided between the two nations.
September 1 » Switzerland mobilizes its forces and the Swiss Parliament elects Henri Guisan to head the Swiss Armed Forces (an event that can happen only during war or mobilization).
September 3 » World War II: France, the United Kingdom, New Zealand and Australia declare war on Germany after the invasion of Poland, forming the Allies.
September 9 » Burmese national hero U Ottama dies in prison after a hunger strike to protest Britain's colonial government.
When copying data from this family tree, please include a reference to the origin: Eva Drenth, "Family tree Diverse", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-drenth/I10669.php : accessed February 6, 2026), "Willemina Helena Antonia Klaassen (1911-)".
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