According to weatherbase.com, the highest recorded temperature for June or July for all four cities: New York, Philadelphia, Chicago, and Detroit is 104 degrees.
For Kansas City the June-July record is 112 degrees.
In Dallas/Fort Worth, Texas, high temperatures exceeded 100°F a total of 69 times, including a record 42 consecutive days from June 23 to August 3. Dallas/Fort Worth reached an all-time high on June 26 and 27, soaring to 113°F (45°C) on both days. In the northern hemisphere summer of 1980 in Dallas/Fort Worth, there were 29 days that either tied or broke records for those respective dates. Wichita Falls, Texas would hit 117°F (48°C), the highest temperature ever recorded in that city to date.
http://en.wikipedia.org/wiki/1980_United_States_heat_wave
You’re right. I was mistaken, in my first post, on this topic. I found a site which states:
“The 1980 United States heat wave was among the most devastating natural disasters in terms of deaths and destruction in U.S. history. The heat wave claimed at least 1,700 lives. Also, because of the massive drought, agricultural damage estimates neared $44 billion (1998 dollars). It is among the billion-dollar weather disasters listed by the National Oceanic and Atmospheric Administration.
A strong high pressure ridge in the central and southern United States allowed temperatures to soar to 90°F (32°C) almost every day from June to September. The drought was also caused for this particular reason.
In Kansas City, Missouri, the high temperature went below 90 only twice and soared above the century mark (100°F, 38°C) for 17 days straight. In Memphis, Tennessee, the temperature reached an all-time high of 108°F (42°C) on July 13, 1980, part of a 15-day stretch of temperatures above 100°F that lasted from July 6-20, 1980.”
Do you remember an American heatwave, that was worse than the 1980 heatwave, since then?