The temperature on April 19, 1911 was between 9.7 °C and 15.3 °C and averaged 12.9 °C. There was 0.2 mm of rain. There was 0.1 hours of sunshine (1%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the south. Source: KNMI
April 2 » The Australian Bureau of Statistics conducts the country's first national census.
April 8 » Dutch physicist Heike Kamerlingh Onnes discovers superconductivity.
May 19 » Parks Canada, the world's first national park service, is established as the Dominion Parks Branch under the Department of the Interior.
May 31 » The President of Mexico Porfirio Díaz flees the country during the Mexican Revolution.
July 1 » Germany despatches the gunship SMSPanther to Morocco, sparking the Agadir Crisis.
October 13 » Prince Arthur, Duke of Connaught and Strathearn, becomes the first Governor General of Canada of royal descent.
Day of marriage April 23, 1938
The temperature on April 23, 1938 was between 5.1 °C and 12.6 °C and averaged 7.8 °C. There was 0.4 mm of rain during 0.5 hours. There was 4.3 hours of sunshine (30%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the north. Source: KNMI
April 10 » The 1938 German parliamentary election and referendum seeks approval for a single list of Nazi candidates and the recent annexation of Austria.
May 25 » Spanish Civil War: The bombing of Alicante kills 313 people.
September 30 » Britain, France, Germany and Italy sign the Munich Agreement, whereby Germany annexes the Sudetenland region of Czechoslovakia.
October 14 » The first flight of the Curtiss P-40 Warhawk fighter plane.
November 14 » The Lions Gate Bridge, connecting Vancouver to the North Shore region, opens to traffic.
December 13 » The Holocaust: The Neuengamme concentration camp opens in the Bergedorf district of Hamburg, Germany.
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/I135802.php : accessed October 10, 2026), "Hendrik de Haan (1911-)".
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