WGN-TV Chief Meteorologist Tom Skilling and the WGN Weather Center staff provide daily coverage of weather in the Chicago area.

Summer's real heat stays in southern U.S.

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While the southern half of the country continues to bake, cooler Canadian-source high pressure looks to dominate Chicago and northeast Illinois weather during
the week ahead.

The weather pattern along the Gulf Coast states and the southwestern U.S. is expected to change very little, so daily highs in the 90s over the Southeast and the lower 100s over the Southwest should persist.

But across the northern tier states, including Illinois and Indiana, average highs are forecast to remain at or slightly below mid-July normals.

Cool summer in city

Chicago's average temperature from June 1 through July 10 has been 67.5 degrees. This is the coolest since 1992, which followed the eruption of Mt. Pinatubo in 1991 north of Manila. That eruption spread a layer of dust aloft around the world that cut back on the amount of solar radiation. This year's average summer-to-date temperature is 2.1 degrees cooler than the normal of 69.6 degrees and only 0.9 degrees above the 66.6 recorded in 1992.

This year's average temperature as of July 10 was 2.1  degrees cooler than the normal of 69.6 degrees and only 0.9 degrees above the 66.6 recorded in 1992.