The temperature on September 12, 1911 was between 9.0 °C and 27.1 °C and averaged 17.7 °C. There was 10.8 hours of sunshine (84%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south east. Source: KNMI
January 21 » The first Monte Carlo Rally takes place.
January 26 » Glenn Curtiss flies the first successful American seaplane.
July 4 » A massive heat wave strikes the northeastern United States, killing 380 people in eleven days and breaking temperature records in several cities.
October 10 » The day after a bomb explodes prematurely, the Wuchang Uprising begins against the Chinese monarchy.
November 17 » Omega Psi Phi fraternity was founded on the campus of Howard University in Washington, D.C.
December 24 » Lackawanna Cut-Off railway line opens in New Jersey and Pennsylvania.
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The Family tree Scheltens publication was prepared by Henk Scheltens (contact is not possible).
When copying data from this family tree, please include a reference to the origin: Henk Scheltens, "Family tree Scheltens", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-scheltens/I331.php : accessed December 31, 2025), "Pieter Marinus de Roo (1911-)".
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