June 5 - A new government of the State of Singapore is sworn in by Sir William Goode. Two former Ministers were re-elected to the Legislative Assembly.
June 14 - A three-front revolutionary invasion by air and sea takes place in the Dominican Republic consisting of exiles aided by Fidel Castro whose purpose was to overthrow dictatorRafael Leonidas Trujillo. Within a few days all but four are captured and executed. Trujillo is killed less than two years later by men partly inspired by the deaths of the 1959 martyrs.
July 7 - 14:28 UT Venus occulted the star Regulus. The rare event which will next occur on October 1, 2044 was used for determining the diameter of Venus and the structure of Venus' atmosphere.