The temperature on April 17, 1961 was between 8.2 °C and 14.1 °C and averaged 10.4 °C. There was 1.8 mm of rain during 1.8 hours. There was 1.1 hours of sunshine (8%). The heavily clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the northeast. Source: KNMI
January 23 » The Portuguese luxury cruise ship Santa Maria is hijacked by opponents of the Estado Novo regime with the intention of waging war until dictator António de Oliveira Salazar is overthrown.
February 13 » An allegedly 500,000-year-old rock is discovered near Olancha, California, US, that appears to anachronistically encase a spark plug.
March 30 » The Single Convention on Narcotic Drugs is signed in New York City.
June 19 » Kuwait declares independence from the United Kingdom.
September 17 » The world's first retractable roof stadium, the Civic Arena, opens in Pittsburgh, Pennsylvania.
October 31 » In the Soviet Union, Joseph Stalin's body is removed from the Lenin's Mausoleum, also known as the Lenin Tomb.
When copying data from this family tree, please include a reference to the origin: Bob Smith, "Family tree Smith", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-smith/I29789.php : accessed February 5, 2026), "Clara Stephanie Hendrika Sleebos (± 1913-1961)".
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