The temperature on December 28, 1912 was between 9.2 °C and 12.5 °C and averaged 11.3 °C. There was 5.0 mm of rain. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the southwest. Source: KNMI
February 25 » Marie-Adélaïde, the eldest of six daughters of Guillaume IV, becomes the first reigning Grand Duchess of Luxembourg.
October 7 » The Helsinki Stock Exchange sees its first transaction.
October 8 » The First Balkan War begins when Montenegro declares war against the Ottoman Empire.
October 17 » Bulgaria, Greece and Serbia declare war on the Ottoman Empire, joining Montenegro in the First Balkan War.
October 19 » Italo-Turkish War: Italy takes possession of what is now Libya from the Ottoman Empire.
December 8 » Leaders of the German Empire hold an Imperial War Council to discuss the possibility that war might break out.
Day of marriage September 7, 1940
The temperature on September 7, 1940 was between 7.2 °C and 21.2 °C and averaged 14.5 °C. There was 9.9 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 August 10, 1939 to September 3, 1940 the cabinet De Geer II, with Jonkheer mr. D.J. de Geer (CHU) as prime minister.
In The Netherlands , there was from September 3, 1940 to July 27, 1941 the cabinet Gerbrandy I, with Prof. dr. P.S. Gerbrandy (ARP) as prime minister.
May 25 » World War II: The German 2nd Panzer Division captures the port of Boulogne-sur-Mer; the surrender of the last French and British troops marks the end of the Battle of Boulogne.
June 14 » Seven hundred twenty-eight Polish political prisoners from Tarnów become the first inmates of the Auschwitz concentration camp.
June 24 » World War II: Operation Collar, the first British Commando raid on occupied France, by No11 Independent Company.
July 6 » Story Bridge, a major landmark in Brisbane, as well as Australia's longest cantilever bridge is formally opened.
July 23 » The United States' Under Secretary of State Sumner Welles issues a declaration on the U.S. non-recognition policy of the Soviet annexation and incorporation of three Baltic states: Estonia, Latvia and Lithuania.
September 12 » Cave paintings are discovered in Lascaux, France.
When copying data from this family tree, please include a reference to the origin: Gert Jonker, "Family tree Jonker", database, Genealogy Online (https://www.genealogieonline.nl/jonker_stamboom/I18197.php : accessed February 28, 2026), "Hendrik de Graaf (1912-)".
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