The temperature on May 3, 1912 was between 5.1 °C and 14.5 °C and averaged 10.7 °C. There was 0.6 mm of rain. There was 4.3 hours of sunshine (29%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west. Source: KNMI
January 8 » The African National Congress is founded, under the name South African Native National Congress (SANNC).
April 17 » Russian troops open fire on striking goldfield workers in northeast Siberia, killing at least 150.
June 4 » Massachusetts becomes the first state of the United States to set a minimum wage.
August 14 » U.S. Marines invade Nicaragua to support the U.S.-backed government installed there after José Santos Zelaya had resigned three years earlier.
October 18 » First Balkan War: King Peter I of Serbia issues a declaration "To the Serbian People", as his country joins the war.
October 24 » First Balkan War: The Battle of Kirk Kilisse concludes with a Bulgarian victory against the Ottoman Empire.
Day of marriage May 30, 1936
The temperature on May 30, 1936 was between 5.8 °C and 14.8 °C and averaged 10.6 °C. There was 2.7 mm of rain during 2.3 hours. There was 2.0 hours of sunshine (12%). The average windspeed was 2 Bft (weak wind) and was prevailing from the southwest. Source: KNMI
March 5 » First flight of K5054, the first prototype Supermarine Spitfire advanced monoplane fighter aircraft in the United Kingdom.
April 5 » Tupelo–Gainesville tornado outbreak: An F5 tornado kills 233 in Tupelo, Mississippi.
July 20 » The Montreux Convention is signed in Switzerland, authorizing Turkey to fortify the Dardanelles and Bosphorus but guaranteeing free passage to ships of all nations in peacetime.
December 5 » The Soviet Union adopts a new constitution and the Kirghiz Soviet Socialist Republic is established as a full Union Republic of the USSR.
December 30 » The United Auto Workers union stages its first sitdown strike.
When copying data from this family tree, please include a reference to the origin: Joop Klavers, "Family tree Klavers", database, Genealogy Online (https://www.genealogieonline.nl/stamboom_klavers/I105083.php : accessed March 8, 2026), "Johannes Gerhardus Hartman (1912-)".
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