PHOENIX - This summer was the hottest on record for Phoenix.
That's according to the National Weather Service, which says the average temperature for June through August was 95.1 degrees.
That beats the previous average summer record high -- 94.9 degrees in 2007. This year and the past two years account for three of the top 10 years, and the weather service says it's due to urbanization.
The explanation is that overnight temperatures aren't as low as they formerly were because the atmosphere in what's called an "urban heat island" has a harder time radiating heat and cooling off.
The weather service reports that the 2013 average summer maximum temperature was 106.4 degrees while the average minimum was 83.7 degrees.