The temperature on March 23, 1911 was between 3.0 °C and 9.9 °C and averaged 5.6 °C. There was 5.5 hours of sunshine (45%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the northeast. Source: KNMI
April 8 » Dutch physicist Heike Kamerlingh Onnes discovers superconductivity.
May 9 » The works of Gabriele D'Annunzio are placed in the Index of Forbidden Books by the Vatican.
July 4 » A massive heat wave strikes the northeastern United States, killing 380 people in eleven days and breaking temperature records in several cities.
September 18 » Russian Premier Pyotr Stolypin is shot at the Kiev Opera House.
November 19 » The Doom Bar in Cornwall claimed two ships, Island Maid and Angele, the latter killing the entire crew except the captain.
December 9 » A mine explosion near Briceville, Tennessee, kills 84 miners despite rescue efforts led by the United States Bureau of Mines.
Day of marriage September 20, 1941
The temperature on September 20, 1941 was between 7.5 °C and 19.3 °C and averaged 13.5 °C. There was 10.5 hours of sunshine (85%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the east. Source: KNMI
In The Netherlands , there was from September 3, 1940 to July 27, 1941 the cabinet Gerbrandy I, with Prof. dr. P.S. Gerbrandy (ARP) as prime minister.
In The Netherlands , there was from July 27, 1941 to February 23, 1945 the cabinet Gerbrandy II, with Prof. dr. P.S. Gerbrandy (ARP) as prime minister.
February 5 » World War II: Allied forces begin the Battle of Keren to capture Keren, Eritrea.
March 7 » Günther Prien and the crew of German submarine U-47, one of the most successful U-boats of World War II, disappear without a trace.
April 16 » World War II: The Nazi-affiliated Ustaše is put in charge of the Independent State of Croatia by the Axis powers after Operation 25 is effected.
June 26 » World War II: Soviet planes bomb Kassa, Hungary (now Košice, Slovakia), giving Hungary the impetus to declare war the next day.
August 31 » World War II: Serbian paramilitary forces defeat Germans in the Battle of Loznica.
November 26 » World War II: Japan's 1st Air Fleet departs the Kuril Islands to strike Pearl Harbor on December 7, 1941.
When copying data from this family tree, please include a reference to the origin: J. van Broekhoven, "Database Van Broekhoven", database, Genealogy Online (https://www.genealogieonline.nl/database-van-broekhoven/I69078.php : accessed March 5, 2026), "Petrus Johannes Josephus Klerks (1911-)".
Copy warning
Genealogical publications are copyright protected. Although data is often retrieved from public archives, the searching, interpreting, collecting, selecting and sorting of the data results in a unique product. Copyright protected work may not simply be copied or republished.
Please stick to the following rules
Request permission to copy data or at least inform the author, chances are that the author gives permission, often the contact also leads to more exchange of data.
Do not use this data until you have checked it, preferably at the source (the archives).
State from whom you have copied the data and ideally also his/her original source.