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The 1911 Eastern North America heat wave was an 11-day heat wave in New York City and other Eastern cities that killed 380 people starting on July 4, 1911. In Nashua, New Hampshire, the temperature peaked at 106 degrees Fahrenheit (41 C). In New York City, 146 people and 600 horses died.
In Boston, the temperature rose to 104° (40 °C) on July 4, an all-time record high that still stands today.
References
1911 Eastern North America heat wave Wikipedia(Text) CC BY-SA