The temperature on April 7, 1917 was between -0.8 °C and 7.3 °C and averaged 2.6 °C. There was 2.6 mm of rain. There was 5.8 hours of sunshine (44%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the north-northeast. Source: KNMI
In The Netherlands , there was from August 29, 1913 to September 9, 1918 the cabinet Cort van der Linden, with Mr. P.W.A. Cort van der Linden (liberaal) as prime minister.
February 3 » First World War: The American entry into World War I begins when diplomatic relations with Germany are severed due to its unrestricted submarine warfare.
April 9 » World War I: The Battle of Arras: The battle begins with Canadian Corps executing a massive assault on Vimy Ridge.
April 12 » World War I: Canadian forces successfully complete the taking of Vimy Ridge from the Germans.
April 16 » Vladimir Lenin returns to Petrograd, Russia, from exile in Switzerland.
November 25 » World War I: German forces defeat Portuguese army of about 1,200 at Negomano on the border of modern-day Mozambique and Tanzania.
December 20 » Cheka, the first Soviet secret police force, is founded.
Day of marriage June 7, 1943
The temperature on June 7, 1943 was between 8.8 °C and 15.8 °C and averaged 11.9 °C. There was 2.3 hours of sunshine (14%). The average windspeed was 2 Bft (weak wind) and was prevailing from the west-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 11 » The Republic of China agrees to the Sino-British New Equal Treaty and the Sino-American New Equal Treaty.
March 21 » Wehrmacht officer Rudolf von Gersdorff plots to assassinate Adolf Hitler by using a suicide bomb, but the plan falls through; von Gersdorff is able to defuse the bomb in time and avoid suspicion.
May 14 » World War II: A Japanese submarine sinks AHSCentaur off the coast of Queensland.
June 1 » BOAC Flight 777 is shot down over the Bay of Biscay by German Junkers Ju 88s, killing British actor Leslie Howard and leading to speculation that it was actually an attempt to kill British Prime Minister Winston Churchill.
October 14 » World War II: The American Eighth Air Force loses 60 of 291 B-17 Flying Fortress during the Second Raid on Schweinfurt.
November 6 » The 1st Ukrainian Front, led by general Nikolai Vatutin, liberates Kyiv from fascist occupation.
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/I467019.php : accessed February 28, 2026), "Jan de Jonge (1917-< 2016)".
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