The temperature on December 6, 1915 was between 5.4 °C and 12.7 °C and averaged 9.8 °C. There was 5.1 mm of rain. There was 1.1 hours of sunshine (14%). The average windspeed was 5 Bft (very strong wind) and was prevailing from the south-southwest. 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.
January 24 » World War I: British Grand Fleet battle cruisers under Vice-Admiral Sir David Beatty engage Rear-Admiral Franz von Hipper's battle cruisers in the Battle of Dogger Bank.
January 31 » World War I: Germany is the first to make large-scale use of poison gas in warfare in the Battle of Bolimów against Russia.
April 18 » French pilot Roland Garros is shot down and glides to a landing on the German side of the lines during World War I.
April 22 » The use of poison gas in World War I escalates when chlorine gas is released as a chemical weapon in the Second Battle of Ypres.
June 29 » The North Saskatchewan River flood of 1915 is the worst flood in Edmonton history.
September 5 » The pacifist Zimmerwald Conference begins.
Day of death January 21, 1979
The temperature on January 21, 1979 was between -3.8 °C and -0.6 °C and averaged -2.3 °C. There was -0.1 mm of rain. The almost completely overcast was. The average windspeed was 2 Bft (weak wind) and was prevailing from the east. Source: KNMI
In The Netherlands , there was from Monday, December 19, 1977 to Friday, September 11, 1981 the cabinet Van Agt I, with Mr. A.A.M. van Agt (CDA/KVP) as prime minister.
February 14 » In Kabul, Setami Milli militants kidnap the American ambassador to Afghanistan, Adolph Dubs who is later killed during a gunfight between his kidnappers and police.
April 1 » Iran becomes an Islamic republic by a 99% vote, officially overthrowing the Shah.
May 9 » Iranian Jewish businessman Habib Elghanian is executed by firing squad in Tehran, prompting the mass exodus of the once 100,000-strong Jewish community of Iran.
August 27 » The Troubles: Eighteen British soldiers are killed in an ambush by the Provisional Irish Republican Army near Warrenpoint, Northern Ireland, in the deadliest attack on British forces during Operation Banner. An IRA bomb also kills British royal family member Lord Mountbatten and three others on his boat at Mullaghmore, Republic of Ireland.
September 16 » The Sugarhill Gang were formed and rappers delight was released.
September 20 » A French-supported coup d'état in the Central African Empire overthrows Emperor Bokassa I.
When copying data from this family tree, please include a reference to the origin: Jaap van der Werff, "Family tree Van der Werff / Kooistra", database, Genealogy Online (https://www.genealogieonline.nl/van-der-werff-stamboom/I504331.php : accessed January 28, 2026), "Johannes (John) Wybenga (1915-1979)".
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