The temperature on December 24, 1953 was between 2.5 °C and 7.4 °C and averaged 5.8 °C. There was 3.0 mm of rain during 3.5 hours. The partly or heavily clouded was. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the south-southwest. Source: KNMI
January 3 » Frances P. Bolton and her son, Oliver from Ohio, become the first mother and son to serve simultaneously in the U.S. Congress.
July 7 » Ernesto "Che" Guevara sets out on a trip through Bolivia, Peru, Ecuador, Panama, Costa Rica, Nicaragua, Honduras, and El Salvador.
August 12 » The 7.2 Ms Ionian earthquake shakes the southern Ionian Islands with a maximum Mercalli intensity of X (Extreme). Between 445 and 800 people are killed.
August 17 » Addiction: First meeting of Narcotics Anonymous takes place, in Southern California.
December 6 » Vladimir Nabokov completes his controversial novel Lolita.
December 10 » British Prime Minister Winston Churchill receives the Nobel Prize in literature.
Day of death May 17, 1971
The temperature on May 17, 1971 was between 11.4 °C and 21.1 °C and averaged 14.7 °C. There was 14.5 mm of rain during 4.6 hours. There was 1.2 hours of sunshine (8%). The heavily clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the southwest. Source: KNMI
February 26 » U.N. Secretary-General U Thant signs United Nations proclamation of the vernal equinox as Earth Day.
July 11 » Copper mines in Chile are nationalized.
September 8 » In Washington, D.C., the John F. Kennedy Center for the Performing Arts is inaugurated, with the opening feature being the premiere of Leonard Bernstein's Mass.
September 11 » The Egyptian Constitution becomes official.
September 13 » Chairman Mao Zedong's second in command and successor Marshal Lin Biao flees the People's Republic of China after the failure of an alleged coup. His plane crashes in Mongolia, killing all aboard.
October 25 » The People's Republic of China replaces the Republic of China at the United Nations.
When copying data from this family tree, please include a reference to the origin: Hans van der Werff, "Family tree Van der Werff", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-van-der-werff/I4841.php : accessed January 30, 2026), "Klaas Jan Sytema (1953-1971)".
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