The temperature on August 31, 1911 was between 5.1 °C and 21.5 °C and averaged 14.4 °C. There was 10.2 hours of sunshine (74%). The average windspeed was 2 Bft (weak wind) and was prevailing from the southwest. Source: KNMI
January 21 » The first Monte Carlo Rally takes place.
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.
July 7 » The United States, UK, Japan, and Russia sign the North Pacific Fur Seal Convention of 1911 banning open-water seal hunting, the first international treaty to address wildlife preservation issues.
August 1 » Harriet Quimby takes her pilot's test and becomes the first U.S. woman to earn an Aero Club of America aviator's certificate.
August 24 » Manuel de Arriaga is elected and sworn-in as the first President of Portugal.
November 1 » World's first combat aerial bombing mission takes place in Libya during the Italo-Turkish War. Second Lieutenant Giulio Gavotti of Italy drops several small bombs.
Day of marriage July 17, 1943
The temperature on July 17, 1943 was between 6.0 °C and 18.5 °C and averaged 14.3 °C. There was 4.4 hours of sunshine (27%). The average windspeed was 2 Bft (weak wind) and was prevailing from the north-northwest. Source: KNMI
In The Netherlands , there was from July 27, 1941 to February 23, 1945 the cabinet Gerbrandy II, with Prof. dr. P.S. Gerbrandy (ARP) as prime minister.
January 15 » World War II: The Soviet counter-offensive at Voronezh begins.
February 19 » World War II: Battle of Kasserine Pass in Tunisia begins.
August 2 » The Holocaust: Jewish prisoners stage a revolt at Treblinka, one of the deadliest of Nazi death camps where approximately 900,000 persons were murdered in less than 18 months.
August 15 » World War II: Battle of Trahili: Superior German forces surround Cretan partisans, who manage to escape against all odds.
October 14 » World War II: Prisoners at the Sobibór extermination camp in Poland revolt against the Germans.
December 4 » World War II: In Yugoslavia, resistance leader Marshal Josip Broz Tito proclaims a provisional democratic Yugoslav government in-exile.
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/I3480.php : accessed January 28, 2026), "Geert Gritter (1911-)".
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