The temperature on May 20, 1911 was between 8.8 °C and 15.8 °C and averaged 11.3 °C. There was 4.2 hours of sunshine (26%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the north. Source: KNMI
January 29 » Mexican Revolution: Mexicali is captured by the Mexican Liberal Party, igniting the Magonista rebellion of 1911.
April 8 » Dutch physicist Heike Kamerlingh Onnes discovers superconductivity.
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 23 » Pilot Earle Ovington makes the first official airmail delivery in America under the authority of the United States Post Office Department
September 29 » Italy declares war on the Ottoman Empire.
December 27 » "Jana Gana Mana", the national anthem of India, is first sung in the Calcutta Session of the Indian National Congress.
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