The temperature on April 30, 1911 was between 4.5 °C and 12.6 °C and averaged 8.2 °C. There was 1.3 mm of rain. There was 4.9 hours of sunshine (33%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the west-northwest. Source: KNMI
January 21 » The first Monte Carlo Rally takes place.
January 29 » Mexican Revolution: Mexicali is captured by the Mexican Liberal Party, igniting the Magonista rebellion of 1911.
April 2 » The Australian Bureau of Statistics conducts the country's first national census.
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 21 » The Mona Lisa is stolen by Vincenzo Peruggia, a Louvre employee.
December 27 » "Jana Gana Mana", the national anthem of India, is first sung in the Calcutta Session of the Indian National Congress.
When copying data from this family tree, please include a reference to the origin: J. Ham, "Family tree Ham", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-ham/I79350.php : accessed February 21, 2026), "Hendrik Peter van Essen (1911-)".
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