Summer of 2011, another hot one

The final numbers won't be in until after midnight, but the summer of 2011 appears to be the fifth-warmest in Philadelphia's 138-year period of record, with an average temperature of 78.

Tha'ts based on the preliminary math by Mark DeLisi, the climatologist at the National Weather Service in Mount Holly.

DeLisi also notes that nine of the 10 warmest summers have occurred since 1991, and he is certain that's more than coincidence.

The odds of that happening randomly are less than 1 in 1,000, he says.

Whether humans are to blame or the fall-out from Sputnik or a natural process, the world has become warmer in recent decades.

Certainly, Philadelphia summers have become warmer. Here is the top 10 list from DeLisi:

2010 -- 79.6

1995 -- 78.6

1994 -- 78.3

1993 -- 78.2

2011 -- 78.0

1991 -- 77.9

2005 -- 77.8

2002 -- 77.7

1999 -- 77.2

1900 --- 77.2

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