Monday, August 3, 2015

Heat History in July

July historically is the hottest month, and this was the hottest of the hottest.

Heat History in July


The period of official temperature records in Philadelphia cover 1,651 months dating to 1874.

And as noted in our online story, among of all of them, July 2011 was the warmest ever, with an average temperature of 82.3.

Although the solar energy peaks with the summer solstice, July historically is the hottest month because it takes awhile for that peak energy to take effect.

August isn't exactly January, but the longer nights tend to erode the heat.

Thus, all 10 of the warmest months on record happen to be Julys. The very warmest August, 1980's, at 79.9, comes in at No. 11 on the all-time list.

Here is the top 10. Again, all 10 are Julys.

2011 -- 82.3

1994 -- 82.1

2010 -- 81.7

1995 -- 81.5

1993 -- 81.4

1955 -- 81.4

1999 -- 81.1

1988 -- 80.7

1952 -- 80.1

1887 -- 80.7



Inquirer Weather Columnist
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Everyone talks about the weather, and here we write about it.

When we’re around and conditions warrant, we’ll keep you updated about what’s coming, but we will do our best always to discuss weather and climate developments in context and remind you that nothing in the atmosphere happens in a vacuum.

Tony Wood has been writing about the atmosphere for The Inquirer for 26 years.

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