The temperature on June 13, 1915 was between 9.1 °C and 23.2 °C and averaged 15.2 °C. There was 11.7 hours of sunshine (70%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the 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.
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 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.
May 7 » World War I: German submarine U-20 sinks RMS Lusitania, killing 1,198 people, including 128 Americans. Public reaction to the sinking turns many former pro-Germans in the United States against the German Empire.
May 23 » World War I: Italy joins the Allies, fulfilling its part of the Treaty of London.
July 16 » At Treasure Island on the Delaware River in the United States, the First Order of the Arrow ceremony takes place and the Order of the Arrow is founded to honor American Boy Scouts who best exemplify the Scout Oath and Law.
August 17 » A Category 4 hurricane hits Galveston, Texas with winds at 135 miles per hour (217km/h).
Day of marriage October 18, 1940
The temperature on October 18, 1940 was between 12.3 °C and 17.6 °C and averaged 13.5 °C. There was 0.2 mm of rain during 0.2 hours. There was 0.1 hours of sunshine (1%). The average windspeed was 2 Bft (weak wind) and was prevailing from the northeast. 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.
February 28 » Basketball is televised for the first time (Fordham University vs. the University of Pittsburgh in Madison Square Garden).
July 2 » The SS Arandora Star is sunk by U-47 in the North Atlantic with the loss of over 800 lives, mostly civilians.
July 5 » World War II: Foreign relations of Vichy France are severed with the United Kingdom.
July 6 » Story Bridge, a major landmark in Brisbane, as well as Australia's longest cantilever bridge is formally opened.
October 7 » World War II: The McCollum memo proposes bringing the United States into the war in Europe by provoking the Japanese to attack the United States.
November 16 » New York City's "Mad Bomber" George Metesky places his first bomb at a Manhattan office building used by Consolidated Edison.
When copying data from this family tree, please include a reference to the origin: J. van Broekhoven, "Database Van Broekhoven", database, Genealogy Online (https://www.genealogieonline.nl/database-van-broekhoven/I293175.php : accessed February 6, 2026), "Johanna Wilhelmina Optendrees (1915-)".
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