The temperature on May 26, 1911 was between 10.9 °C and 22.0 °C and averaged 16.8 °C. There was 4.1 hours of sunshine (25%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the east-southeast. Source: KNMI
January 21 » The first Monte Carlo Rally takes place.
July 4 » A massive heat wave strikes the northeastern United States, killing 380 people in eleven days and breaking temperature records in several cities.
August 1 » Harriet Quimby takes her pilot's test and becomes the first U.S. woman to earn an Aero Club of America aviator's certificate.
August 21 » The Mona Lisa is stolen by Vincenzo Peruggia, a Louvre employee.
October 5 » The Kowloon–Canton Railway commences service.
December 29 » Mongolia gains independence from the Qing dynasty, enthroning 8th Jebtsundamba Khutughtu as Khagan of Mongolia.
When copying data from this family tree, please include a reference to the origin: Erik Develter, "Family tree Erik Develter", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-erik-develter/I7511575641840619.php : accessed May 9, 2025), "Marie Madeleine Develtere (1911-)".
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