George Isobar discusses July weather 8.05.09

Posted in 2009 August

By DAVID GREEN

Chillier than average July temperatures are nothing new around here, says Morenci climate observer George Isobar, but this last one was a little more extreme.

“I was surprised when I started looking back at recent totals from July,” Isobar said. “2007, 2004 and 2003 were all below average. 2000, 1997 and 1996 were all below average.”

But none of them came close to matching the past July that finished 4.1° below the normal for this time of year.

“It’s not that it was a cold month,” he said. “Twenty-one of the 31 days were in the 80s and the rest were in the 70s. We just didn’t have the extreme heat of most years.”

The high for the month was 87° on July 11 and there were four days that reached 86°.

“It was just a pretty comfortable month,” Isobar said. “Maybe not so much if you were out and about early in the morning.”

The temperature dropped into the 50s nearly every morning—except for those two times in the 40s. The low of 46° was recorded July 13, just two days after the high for the month.

“There weren’t any really extreme temperature days,” Isobar said, “but the morning lows were nearly all a little below average, and that led to the -4.1° difference. I heard that this was the third chilliest on record for Toledo.”

Those who challenge the notion of global warming are having fun with the chilly July, but a meteorologist from the National Weather Service office in Cleveland said it’s a simple matter of the jet stream.

An unusually large number of low pressure systems have pushed into this region from central Canada to keep things on the cool side.

“It’s not regional weather but long-term trends that have climate scientists concerned,” Isobar said.

Not only was the temperature abnormal, but precipitation wasn’t as expected, either.

“We’ve had several drier Julys,” Isobar said, “but this past one is right down there with them.”

His gauge in Morenci measured only 1.51 inches. Add the last couple of weeks of June and the tally wouldn’t be much different.

Conditions vary from area to area, he noted. On a day that Morenci received 0.15 of an inch, Toledo was drenched with  1.17.

“Toledo actually finished above average in the rainfall department,” Isobar said. “We came out two inches below average.”

AUGUST—If the jet stream pattern changes, things could get back to normal—some days in the 90s, a few thunderstorms, some mugginess.

“It’s not here yet,” Isobar said, “but enjoy it while you can. The early forecast for the weekend looks like August.”

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