The temperature on June 23, 1911 was between 12.2 °C and 19.3 °C and averaged 15.2 °C. There was 6.4 mm of rain. There was 1.2 hours of sunshine (7%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south. Source: KNMI
January 12 » The University of the Philippines College of Law is formally established; three future Philippine presidents are among the first enrollees.
April 8 » Dutch physicist Heike Kamerlingh Onnes discovers superconductivity.
July 4 » A massive heat wave strikes the northeastern United States, killing 380 people in eleven days and breaking temperature records in several cities.
August 14 » United States Senate leaders agree to rotate the office of President pro tempore of the Senate among leading candidates to fill the vacancy left by William P. Frye's death.
September 1 » The armored cruiser Georgios Averof is commissioned into the Greek Navy. It now serves as a museum ship.
September 18 » Russian Premier Pyotr Stolypin is shot at the Kiev Opera House.
Day of death April 20, 1980
The temperature on April 20, 1980 was between 0.9 °C and 9.1 °C and averaged 5.3 °C. There was 5.9 mm of rain during 3.1 hours. There was 5.4 hours of sunshine (38%). The partly or heavily clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the north-northwest. Source: KNMI
In The Netherlands , there was from Monday, December 19, 1977 to Friday, September 11, 1981 the cabinet Van Agt I, with Mr. A.A.M. van Agt (CDA/KVP) as prime minister.
January 28 » USCGCBlackthorn collides with the tanker Capricorn while leaving Tampa, Florida and capsizes, killing 23 Coast Guard crewmembers.
March 18 » A Vostok-2M rocket at Plesetsk Cosmodrome Site 43 explodes during a fueling operation, killing 48 people.
July 19 » Opening of the Summer Olympics in Moscow.
September 12 » Military coup in Turkey.
September 22 » Iraq invades Iran.
November 20 » Lake Peigneur drains into an underlying salt deposit. A misplaced Texaco oil probe had been drilled into the Diamond Crystal Salt Mine, causing water to flow down into the mine, eroding the edges of the hole.
When copying data from this family tree, please include a reference to the origin: Hendrik Dreyer, "Dreyer Tree", database, Genealogy Online (https://www.genealogieonline.nl/dreyer-tree/I17024.php : accessed January 22, 2026), "Willem Hendrik Frederik Dreyer (1911-1980)".
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