The temperature on May 15, 1917 was between 10.3 °C and 18.5 °C and averaged 13.0 °C. There was 6.5 hours of sunshine (42%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west. Source: KNMI
In The Netherlands , there was from August 29, 1913 to September 9, 1918 the cabinet Cort van der Linden, with Mr. P.W.A. Cort van der Linden (liberaal) as prime minister.
January 31 » World War I: Germany announces that its U-boats will resume unrestricted submarine warfare after a two-year hiatus.
March 8 » The United States Senate votes to limit filibusters by adopting the cloture rule.
May 26 » Several powerful tornadoes rip through Illinois, including the city of Mattoon.
June 7 » World War I: Battle of Messines: Allied soldiers detonate a series of mines underneath German trenches at Messines Ridge, killing 10,000 German troops.
November 24 » In Milwaukee, nine members of the Milwaukee Police Department are killed by a bomb, the most deaths in a single event in U.S. police history until the September 11 attacks in 2001.
December 7 » World War I: The United States declares war on Austria-Hungary.
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