Here are some headlines and tidbits from Medford Mail Tribune, July 5th edition, about a heat wave that hit the east in 1811.
120 Deaths in Windy City
in this article it mentions 750 people were sleeping in the city parks. They weren't homeless they were trying to combat the heat.
Temp was recorded at 100 degrees.
64 Perish in the past 3 Days in New York
in this article it also mentions crops drying up in the middle west
Iowa Fruit and Vegetables destroyed
Omaha, Neb temps reached 105, deaths reported but no number given.
The source was 1911 Medford Mail Tribune, July 5th.