The temperature on November 22, 1887 was about 3.0 °C. There was 0.4 mm of rain. The air pressure was 9 kgf/m2 and came mainly from the northeast. The airpressure was 76 cm mercury. The atmospheric humidity was 94%. Source: KNMI
In The Netherlands , there was from April 23, 1884 to April 21, 1888 the cabinet Heemskerk, with Mr. J. Heemskerk Azn. (conservatief) as prime minister.
April 4 » Argonia, Kansas elects Susanna M. Salter as the first female mayor in the United States.
May 9 » Buffalo Bill Cody's Wild West Show opens in London.
June 8 » Herman Hollerith applies for US patent #395,781 for the 'Art of Compiling Statistics', which was his punched card calculator.
June 18 » The Reinsurance Treaty between Germany and Russia is signed.
July 6 » David Kalākaua, monarch of the Kingdom of Hawaii, is forced to sign the Bayonet Constitution, which transfers much of the king's authority to the Legislature of the Kingdom of Hawaii.
July 26 » Publication of the Unua Libro, founding the Esperanto movement.
Day of death December 13, 1957
The temperature on December 13, 1957 was between 1.2 °C and 4.3 °C and averaged 2.1 °C. There was 3.8 mm of rain during 2.9 hours. The almost completely overcast was. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the north-northeast. Source: KNMI
When copying data from this family tree, please include a reference to the origin: Peeters Mathieu, "FutureHistory", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-riske/I12442.php : accessed December 25, 2025), "Leo de Groep (1887-1957)".
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