The temperature on June 15, 1911 was between 6.4 °C and 17.9 °C and averaged 12.3 °C. There was 9.4 mm of rain. There was 8.7 hours of sunshine (52%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the north-northwest. Source: KNMI
January 14 » Roald Amundsen's South Pole expedition makes landfall on the eastern edge of the Ross Ice Shelf.
January 21 » The first Monte Carlo Rally takes place.
January 26 » Glenn Curtiss flies the first successful American seaplane.
June 22 » Mexican Revolution: Government forces bring an end to the Magonista rebellion of 1911 in the Second Battle of Tijuana.
July 7 » The United States, UK, Japan, and Russia sign the North Pacific Fur Seal Convention of 1911 banning open-water seal hunting, the first international treaty to address wildlife preservation issues.
December 9 » A mine explosion near Briceville, Tennessee, kills 84 miners despite rescue efforts led by the United States Bureau of Mines.
When copying data from this family tree, please include a reference to the origin: Hans Weening, "Family tree Weening", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-weening/I138750.php : accessed October 20, 2026), "Ernst Halbersma (1911-)".
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