The temperature on May 21, 1911 was between 6.5 °C and 17.7 °C and averaged 11.8 °C. There was 11.1 hours of sunshine (70%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the north. Source: KNMI
February 18 » The first official flight with airmail takes place from Allahabad, United Provinces, British India (now India), when Henri Pequet, a 23-year-old pilot, delivers 6,500 letters to Naini, about 10 kilometres (6.2mi) away.
May 21 » President of Mexico Porfirio Díaz and the revolutionary Francisco Madero sign the Treaty of Ciudad Juárez to put an end to the fighting between the forces of both men, concluding the initial phase of the Mexican Revolution.
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.
September 29 » Italy declares war on the Ottoman Empire.
November 11 » Many cities in the Midwestern United States break their record highs and lows on the same day as a strong cold front rolls through.
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: Wim de Vries, "Family tree Kaempff", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-kaempff/I780.php : accessed January 23, 2026), "Jacoba Christine Kroes (1911-)".
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