The temperature on January 4, 1890 was about 3.4 °C. There was 0.5 mm of rain. The air pressure was 3 kgf/m2 and came mainly from the south-southeast. The airpressure was 76 cm mercury. The atmospheric humidity was 93%. Source: KNMI
January 1 » Eritrea is consolidated into a colony by the Italian government.
January 22 » The United Mine Workers of America is founded in Columbus, Ohio.
September 24 » The Church of Jesus Christ of Latter-day Saints officially renounces polygamy.
October 12 » Uddevalla Suffrage Association is formed.
December 22 » Cornwallis Valley Railway begins operation between Kentville and Kingsport, Nova Scotia.
December 30 » Following the Wounded Knee Massacre, the United States Army and Lakota warriors face off in the Drexel Mission Fight.
Day of death May 18, 1968
The temperature on May 18, 1968 was between 2.6 °C and 11.3 °C and averaged 6.4 °C. There was 11.3 mm of rain during 5.4 hours. There was 2.7 hours of sunshine (17%). The partly or heavily clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the northwest. 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.
April 6 » Pierre Elliott Trudeau wins the Liberal Leadership Election, and becomes Prime Minister of Canada soon after.
July 1 » The Treaty on the Non-Proliferation of Nuclear Weapons is signed in Washington, D.C., London and Moscow by sixty-two countries.
September 13 » Cold War: Albania leaves the Warsaw Pact.
October 14 » The first live TV broadcast by American astronauts in orbit is performed by the Apollo 7 crew.
November 22 » The Beatles release The Beatles (known popularly as The White Album).
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/I3669.php : accessed January 9, 2026), "Dirk Hendricus Wisman (1890-1968)".
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