10 All-Time Hottest Weather Temperature Days in Philadelphia History
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 recorded 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
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.
Philadelphia is situated in the southeastern part of Pennsylvania, near the New Jersey and Delaware borders. To the west of Philadelphia the terrain climbs with cooler temperatures and more clouds than Philadelphia gets.
Philadelphia is in the southern tip of the humid continental climate zone, which gives Philadelphia which creates weather characteristics of the humid subtropical climate that lies just to their east in Delaware and Maryland.
It can also be humid in Philadelphia also, which makes for a miserably hot day when the temperature gets into the 90s and above 100. During humid days, the heat index can get as high as 105 degrees and higher. This of course is dangerous and can cause heat exhaustion. Not to mention the overnight lows on these hot humid days might not drop below 80s.
Philadelphia is the 6th largest city in the United States. Being so large and spread out can cause what is known as the heat island effect, causing temperatures to be hotter than normal and fall less at night.
Statistics are showing that Pennsylvania and the Philadelphia area are getting warmer. August 2016 was the hottest month ever recorded across Pennsylvania. This hot trend is a concern, but more worrisome is the shrinking number of summer periods they spend at or below the historical average. Only once since 1985 has Pennsylvania seen summer temps dropping below 67 degrees
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