The temperature on April 30, 1917 was between 2.5 °C and 16.2 °C and averaged 9.6 °C. There was 11.4 hours of sunshine (77%). The average windspeed was 2 Bft (weak wind) and was prevailing from the northwest. 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.
January 9 » World War I: The Battle of Rafa is fought near the Egyptian border with Palestine.
March 15 » Tsar Nicholas II of Russia abdicates the Russian throne ending the 304-year Romanov dynasty.
June 28 » World War I: Greece joins the Allied powers.
July 27 » World War I: The Allies reach the Yser Canal at the Battle of Passchendaele.
October 31 » World War I: Battle of Beersheba: The "last successful cavalry charge in history".
December 6 » Finland declares independence from Soviet Russia.
Day of marriage May 9, 1942
The temperature on May 9, 1942 was between 1.5 °C and 19.2 °C and averaged 10.5 °C. There was 13.7 hours of sunshine (89%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the northeast. Source: KNMI
In The Netherlands , there was from July 27, 1941 to February 23, 1945 the cabinet Gerbrandy II, with Prof. dr. P.S. Gerbrandy (ARP) as prime minister.
January 30 » World War II: Battle of Ambon. Japanese forces invade the island of Ambon in the Dutch East Indies. Some 300 captured Allied troops are massacred at Laha airfield. Three-fourths of remaining POWs will not have survived by the end of the war, including 250 men who will be shipped to Hainan Island in South China Sea and never returned.
February 22 » World War II: President Franklin D. Roosevelt orders General Douglas MacArthur out of the Philippines as the Japanese victory becomes inevitable.
March 5 » World War II: Japanese forces capture Batavia, capital of Dutch East Indies, which is left undefended after the withdrawal of the KNIL garrison and Australian Blackforce battalion to Buitenzorg and Bandung.
June 21 » World War II: A Japanese submarine surfaces near the Columbia River in Oregon, firing 17 shells at Fort Stevens in one of only a handful of attacks by Japan against the United States mainland.
July 22 » Grossaktion Warsaw: The systematic deportation of Jews from the Warsaw ghetto begins.
December 15 » World War II: The Battle of Mount Austen, the Galloping Horse, and the Sea Horse begins during the Guadalcanal Campaign.
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/I558908.php : accessed March 15, 2026), "Johan Wilhelm Heller (1917-< 2016)".
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