The temperature on December 21, 1909 was between -3.6 °C and 2.7 °C and averaged -0.7 °C. There was 5.3 hours of sunshine (69%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south-southwest. Source: KNMI
January 28 » United States troops leave Cuba with the exception of Guantanamo Bay Naval Base after being there since the Spanish–American War.
February 23 » The AEA Silver Dart makes the first powered flight in Canada and the British Empire.
March 10 » By signing the Anglo-Siamese Treaty of 1909, Thailand relinquishes its sovereignty over the Malay states of Kedah, Kelantan, Perlis and Terengganu, which become British protectorates.
May 31 » The National Negro Committee, forerunner to the National Association for the Advancement of Colored People (NAACP), convenes for the first time.
June 26 » The Science Museum in London comes into existence as an independent entity.
August 24 » Workers start pouring concrete for the Panama Canal.
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/I135.php : accessed January 7, 2026), "N.N. Opperman (1909-1909)".
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