The temperature on July 13, 1915 was between 8.0 °C and 20.0 °C and averaged 15.0 °C. There was 7.6 hours of sunshine (46%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west-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 13 » The 6.7 Mw Avezzano earthquake shakes the Province of L'Aquila in Italy with a maximum Mercalli intensity of XI (Extreme), killing between 29,978–32,610.
January 25 » Alexander Graham Bell inaugurates U.S. transcontinental telephone service, speaking from New York to Thomas Watson in San Francisco.
May 23 » World War I: Italy joins the Allies, fulfilling its part of the Treaty of London.
June 21 » The U.S. Supreme Court hands down its decision in Guinn v. United States 238 US 347 1915, striking down Oklahoma grandfather clause legislation which had the effect of denying the right to vote to blacks.
August 29 » US Navy salvage divers raise F-4, the first U.S. submarine sunk in an accident.
October 13 » First World War: The Battle of the Hohenzollern Redoubt marks the end of the Battle of Loos.
Day of death April 21, 1999
The temperature on April 21, 1999 was between 9.3 °C and 17.9 °C and averaged 12.5 °C. There was 10.5 mm of rain during 5.0 hours. There was 7.2 hours of sunshine (51%). The partly or heavily clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south-southwest. Source: KNMI
January 21 » War on Drugs: In one of the largest drug busts in American history, the United States Coast Guard intercepts a ship with over 4,300 kilograms (9,500lb) of cocaine on board.
February 23 » Kurdish rebel leader Abdullah Öcalan is charged with treason in Ankara, Turkey.
March 29 » The Dow Jones Industrial Average closes above the 10,000 mark (10,006.78) for the first time, during the height of the dot-com bubble.
October 31 » EgyptAir Flight 990 crashes into the Atlantic Ocean near Nantucket, killing all 217 people on board.
November 27 » The centre-left Labour Party takes control of the New Zealand government with leader Helen Clark becoming the first elected female Prime Minister in New Zealand's history.
December 22 » Just after taking off from London Stansted Airport, Korean Air Cargo Flight 8509 crashes into Hatfield Forest near Great Hallingbury, killing all four people on board.
When copying data from this family tree, please include a reference to the origin: Hans Weening, "Family tree Weening", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-weening/I187548.php : accessed October 14, 2026), "Harmen Siedsma (1915-1999)".
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