The temperature on April 23, 1890 was about 12.5 °C. There was 1 mm of rain. The air pressure was 12 kgf/m2 and came mainly from the west-southwest. The airpressure was 76 cm mercury. The atmospheric humidity was 65%. Source: KNMI
March 20 » Prime Minister of the German Empire Otto von Bismarck is dismissed by Emperor Wilhelm II.
April 7 » Completion of the first Lake Biwa Canal.
April 14 » The Pan-American Union is founded by the First International Conference of American States in Washington, D.C.
June 1 » The United States Census Bureau begins using Herman Hollerith's tabulating machine to count census returns.
July 10 » Wyoming is admitted as the 44th U.S. state.
November 4 » City and South London Railway: London's first deep-level tube railway opens between King William Street and Stockwell.
Day of marriage April 19, 1917
The temperature on April 19, 1917 was between -1.6 °C and 7.6 °C and averaged 4.1 °C. There was 1.9 mm of rain. There was 0.9 hours of sunshine (6%). 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.
August 30 » Vietnamese prison guards led by Trịnh Văn Cấn mutiny at the Thái Nguyên penitentiary against local French authority.
November 26 » The National Hockey League is formed, with the Montreal Canadiens, Montreal Wanderers, Ottawa Senators, Quebec Bulldogs, and Toronto Arenas as its first teams.
December 7 » World War I: The United States declares war on Austria-Hungary.
Day of death August 2, 1951
The temperature on August 2, 1951 was between 16.3 °C and 24.1 °C and averaged 19.6 °C. There was 10.0 hours of sunshine (65%). The partly clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the northwest. Source: KNMI
From August 7, 1948 till March 15, 1951 the Netherlands had a cabinet Drees - Van Schaik with the prime ministers Dr. W. Drees (PvdA) and Mr. J.R.H. van Schaik (KVP).
In The Netherlands , there was from March 15, 1951 to September 2, 1952 the cabinet Drees I, with Dr. W. Drees (PvdA) as prime minister.
February 6 » The Canadian Army enters combat in the Korean War.
March 7 » Iranian prime minister Ali Razmara is assassinated by Khalil Tahmasebi, a member of the Islamic fundamentalist Fada'iyan-e Islam, inside a mosque in Tehran.
April 11 » Korean War: President Harry Truman relieves General of the Army Douglas MacArthur of overall command in Korea.
May 3 » London's Royal Festival Hall opens with the Festival of Britain.
July 10 » Korean War: Armistice negotiations begin at Kaesong.
October 3 » Korean War: The First Battle of Maryang San pits Commonwealth troops against communist Chinese troops.
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/I79469.php : accessed February 10, 2026), "Jochum Koopmans (1890-1951)".
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