The temperature on June 13, 1911 was between 5.3 °C and 17.0 °C and averaged 11.6 °C. There was 5.2 mm of rain. There was 7.3 hours of sunshine (44%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the north-northeast. Source: KNMI
April 8 » Dutch physicist Heike Kamerlingh Onnes discovers superconductivity.
May 31 » The President of Mexico Porfirio Díaz flees the country during the Mexican Revolution.
July 7 » The United States, UK, Japan, and Russia sign the North Pacific Fur Seal Convention of 1911 banning open-water seal hunting, the first international treaty to address wildlife preservation issues.
November 1 » World's first combat aerial bombing mission takes place in Libya during the Italo-Turkish War. Second Lieutenant Giulio Gavotti of Italy drops several small bombs.
November 11 » Many cities in the Midwestern United States break their record highs and lows on the same day as a strong cold front rolls through.
December 29 » Sun Yat-sen becomes the provisional President of the Republic of China; he formally takes office on January 1, 1912.
Day of marriage August 18, 1938
The temperature on August 18, 1938 was between 11.2 °C and 18.7 °C and averaged 15.1 °C. There was 4.9 hours of sunshine (34%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the west-southwest. Source: KNMI
March 18 » Mexico creates Pemex by expropriating all foreign-owned oil reserves and facilities.
July 10 » Howard Hughes begins a 91-hour airplane flight around the world that will set a new record.
July 17 » Douglas Corrigan takes off from Brooklyn to fly the "wrong way" to Ireland and becomes known as "Wrong Way" Corrigan.
September 5 » Chile: A group of youths affiliated with the fascist National Socialist Movement of Chile are executed after surrendering during a failed coup.
October 14 » The first flight of the Curtiss P-40 Warhawk fighter plane.
December 16 » Adolf Hitler institutes the Cross of Honour of the German Mother.
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/I112959.php : accessed October 19, 2026), "Wytske Nicolai (1911-)".
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