The temperature on July 28, 1910 was between 9.9 °C and 22.0 °C and averaged 16.7 °C. There was 5.6 hours of sunshine (36%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south east. Source: KNMI
January 15 » Construction ends on the Buffalo Bill Dam in Wyoming, United States, which was the highest dam in the world at the time, at 325ft (99m).
March 8 » French aviator Raymonde de Laroche becomes the first woman to receive a pilot's license.
May 4 » The Royal Canadian Navy is created.
June 19 » The first Father's Day is celebrated in Spokane, Washington.
July 4 » The Johnson–Jeffries riots occur after African-American boxer Jack Johnson knocks out white boxer Jim Jeffries in the 15th round. Between 11 and 26 people are killed and hundreds more injured.
August 20 » Extremely dry and windy weather in the Inland Northwest of the United States causes several small wildfires to coalesce into the Great Fire of 1910, burning approximately 3million acres (12,000km) and killing 87 people.
Day of marriage April 15, 1939
The temperature on April 15, 1939 was between 8.9 °C and 13.5 °C and averaged 10.7 °C. There was 1.7 hours of sunshine (12%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the west-southwest. Source: KNMI
In The Netherlands , there was from June 24, 1937 to July 25, 1939 the cabinet Colijn IV, with Dr. H. Colijn (ARP) as prime minister.
In The Netherlands , there was from July 25, 1939 to August 10, 1939 the cabinet Colijn V, with Dr. H. Colijn (ARP) as prime minister.
In The Netherlands , there was from August 10, 1939 to September 3, 1940 the cabinet De Geer II, with Jonkheer mr. D.J. de Geer (CHU) as prime minister.
August 27 » First flight of the turbojet-powered Heinkel He 178, the world's first jet aircraft.
September 19 » World War II: The Battle of Kępa Oksywska concludes, with Polish losses reaching roughly 14% of all the forces engaged.
October 8 » World War II: Germany annexes western Poland.
November 8 » Venlo Incident: Two British agents of SIS are captured by the Germans.
December 18 » World War II: The Battle of the Heligoland Bight, the first major air battle of the war, takes place.
December 27 » Winter War: Finland holds off a Soviet attack in the Battle of Kelja.
Day of death August 5, 1968
The temperature on August 5, 1968 was between 16.3 °C and 25.5 °C and averaged 19.9 °C. There was 1.1 mm of rain during 1.3 hours. There was 5.3 hours of sunshine (35%). The partly or heavily clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the east. Source: KNMI
January 21 » A B-52 bomber crashes near Thule Air Base, contaminating the area after its nuclear payload ruptures. One of the four bombs remains unaccounted for after the cleanup operation is complete.
March 17 » As a result of nerve gas testing by the U.S. Army Chemical Corps in Skull Valley, Utah, over 6,000 sheep are found dead.
April 7 » Motor racing world champion Jim Clark is killed in an accident during a Formula Two race at Hockenheim.
June 9 » U.S. President Lyndon B. Johnson declares a national day of mourning following the assassination of Senator Robert F. Kennedy.
August 1 » The coronation is held of Hassanal Bolkiah, the 29th Sultan of Brunei.
September 13 » Cold War: Albania leaves the Warsaw Pact.
When copying data from this family tree, please include a reference to the origin: Hans Opperman, "Family tree Opperman", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-opperman/I731.php : accessed January 8, 2026), "Josephus Johannes Opperman (1910-1968)".
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