The temperature on June 16, 1911 was between 4.2 °C and 19.1 °C and averaged 13.0 °C. There was 9.4 hours of sunshine (56%). The average windspeed was 2 Bft (weak wind) and was prevailing from the north-northeast. Source: KNMI
January 18 » Eugene B. Ely lands on the deck of the USSPennsylvania anchored in San Francisco Bay, the first time an aircraft landed on a ship.
April 27 » Following the resignation and death of William P. Frye, a compromise is reached to rotate the office of President pro tempore of the United States Senate.
August 24 » Manuel de Arriaga is elected and sworn-in as the first President of Portugal.
August 29 » The Canadian Naval Service becomes the Royal Canadian Navy.
September 18 » Russian Premier Pyotr Stolypin is shot at the Kiev Opera House.
October 10 » The day after a bomb explodes prematurely, the Wuchang Uprising begins against the Chinese monarchy.
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/I89638.php : accessed October 22, 2026), "Siemen Jacob Katsma (1911-)".
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