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Looks like Dr. Christy had some good comments:

John Christy’s Testimony before the Senate EPW today

**************************************EXCERPT from the comments ******************************************

Theo Goodwin says:

August 1, 2012 at 10:50 am

Wonderful work, Dr. Christy.

He mentions, once again, an old dinosaur whose very existence should have caused all climate scientists and meteorologists to blush with shame. He writes:

“The problem with the popular surface temperature datasets is they use the average of the
daytime high and nighttime low as their measurement (i.e. (TMax+TMin)/2).”

This “average,” this contrivance, is one of the most bone-headed ideas known to mankind. Why people who call themselves scientists, or even TV weathermen, would “average” crucial pieces of raw data, especially pieces that are qualitatively different in character, and then use that average to create the all important “surface temperature datasets” is a question that should strike terror into everyone interested in the quality of climate science or even TV meteorology. Stupid, stupid, stupid, stupid, stupid, stupid.

Can we now agree to use the raw data?

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Temperature averaging is ridiculous. Especially if you pick constrained day and night time periods. The night time temps are related to heat retention. Basically, how much moisture is in the air. High moisture content or high humidity, will not allow the day time high temps to fall significantly, until early next morning. In fact, here in West Texas we see our peak temps at 5-8 pm right now. The low temp peaks occur at 6-8 am. Both times while the sun is visible, but low on the horizon.