The temperature on June 3, 1911 was between 13.0 °C and 26.4 °C and averaged 18.3 °C. There was 18.6 mm of rain. There was 8.4 hours of sunshine (51%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south east. Source: KNMI
January 26 » Glenn Curtiss flies the first successful American seaplane.
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.
July 4 » A massive heat wave strikes the northeastern United States, killing 380 people in eleven days and breaking temperature records in several cities.
July 7 » The United States, UK, Japan, and Russia sign the North Pacific Fur Seal Convention of 1911 banning open-water seal hunting, the first international treaty to address wildlife preservation issues.
August 29 » The Canadian Naval Service becomes the Royal Canadian Navy.
October 24 » Orville Wright remains in the air nine minutes and 45 seconds in a glider at Kill Devil Hills, North Carolina.
When copying data from this family tree, please include a reference to the origin: Joop Klavers, "Family tree Klavers", database, Genealogy Online (https://www.genealogieonline.nl/stamboom_klavers/I30751.php : accessed January 29, 2026), "Roelof Koekoek (1911-)".
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