The 1911 Eastern North America heat wave was an 11-day severe heat wave that killed at least 380 people though estimates have put the death toll as high as 2,000 people. The heat wave began on July 4, 1911 and didn't cease until July 15. In Nashua, New Hampshire, the temperature peaked at 106 °F (41 °C). In New York City alone, 158 people and 600 horses died.