The temperature on March 13, 1890 was about 7.1 °C. The air pressure was 1 kgf/m2 and came mainly from the south-southwest. The airpressure was 77 cm mercury. The atmospheric humidity was 79%. Source: KNMI
April 14 » The Pan-American Union is founded by the First International Conference of American States in Washington, D.C.
July 26 » In Buenos Aires, Argentina the Revolución del Parque takes place, forcing President Miguel Ángel Juárez Celman's resignation.
August 6 » At Auburn Prison in New York, murderer William Kemmler becomes the first person to be executed by electric chair.
September 12 » Salisbury, Rhodesia, is founded.
November 4 » City and South London Railway: London's first deep-level tube railway opens between King William Street and Stockwell.
December 29 » Wounded Knee Massacre on Pine Ridge Indian Reservation, 300 Lakota are killed by the United States 7th Cavalry Regiment.
Day of death June 18, 1954
The temperature on June 18, 1954 was between 14.7 °C and 21.4 °C and averaged 17.5 °C. There was 3.4 hours of sunshine (20%). The partly or heavily clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south-southwest. Source: KNMI
February 23 » The first mass inoculation of children against polio with the Salk vaccine begins in Pittsburgh.
February 28 » The first color television sets using the NTSC standard are offered for sale to the general public.
March 19 » Joey Giardello knocks out Willie Tory in round seven at Madison Square Garden in the first televised prize boxing fight shown in colour.
April 22 » Red Scare: Witnesses begin testifying and live television coverage of the Army–McCarthy hearings begins.
June 27 » The FIFA World Cup quarterfinal match between Hungary and Brazil, highly anticipated to be exciting, instead turns violent, with three players ejected and further fighting continuing after the game.
November 13 » Great Britain defeats France to capture the first ever Rugby League World Cup in Paris in front of around 30,000 spectators.
When copying data from this family tree, please include a reference to the origin: Peter Ens, "Family tree Ens", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-ens/I4595.php : accessed February 25, 2026), "Jan Wonder (1890-1954)".
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