These are the ten hottest weather temperature days in Philadelphia history, dating back to 1873. On July 22, 2011, the temperature reached 104 degrees in Philadelphia. That ties the second hottest temperature ever rcorded in the City of Brotherly Love of Philadelphia.
I live in New Jersey across the Delaware River, northeast of Philadelphia. I used to travel to Philadelphia a couple times a week on business, and it definitely gets hotter in Philly than it does in northwestern New Jersey where I live. It also gets hotter in Philadelphia than it does in New York City. For comparison purposes see 100 Degree Weather Temperature Days in New York City.

10 Hottest Temperature Days in Philadelphia History
1. August 7, 1918 - 106 degrees
T-2. July 3, 1966 - 104 degrees
T-2. July 10, 1936 - 104 degrees
T-2. July 22, 2011 - 104 degrees
T-4. July 7, 2010 - 103 degrees
T-4. July 15, 1995 - 103 degrees
T-4. July 4, 1966 - 103 degrees
T-4. July 9, 1936 - 103 degrees
T-4. July 21, 1930 - 103 degrees
T-4. August 6, 1918 - 103 degrees
T-4. July 2, 1901 - 103 degrees
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Comparing Hottest Weather Days in Philadelphia to New York
There have been 11 times in Philadelphia history dating back to 1873 when the temperatures reached or exceeded 103 degrees.
There have been 8 times in New York City history dating back to 1870 when the temperature reached or exceeded 103 degrees.
Not really a huge difference, but a big enough difference to show that Philadelphia does get hotter than New York City does. New York is right along the Atlantic Ocean, and subject to more cooling breezes coming in offshore. Philadelphia is up the Delaware River off the Atlantic Ocean. So the cooling ocean breezes have slightly less effect overall.
For more see 100 Degree Weather Temperature Days in New York City History
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Source:http://www.weather.gov/climate/xmacis.php?wfo=phi
Excellent. I wouldn't have known these things. vote up.