Overview & Graphics
September 2017 got off to a cool start but flipped to extremely warm in the second half of the month, highlighted by the historic late season heat wave from September 20th to 26th. Much of the area experienced 90+ degree temperatures for that entire one week period. The very dry weather pattern that formed in August 2017 intensified in September 2017, with many areas, including Chicago and Rockford, receiving less than an inch of rainfall for the month.
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| September 2017 Review: Precipitation and Temperatures. Climate Maps are from the Midwest and Northeast Regional Climate Centers and Illinois State Water Survey | September 2017 Review: Extremely Dry in Chicago and Rockford | September 2017 Review: One of the fewest days with rain for a month on record in Chicago |
Chicago and Rockford Monthly Summary
Public Information Statement
National Weather Service Chicago IL
1014 AM CDT Sun Oct 1 2017 /1114 AM EDT Sun Oct 1 2017/
...A Look Back at the Climate for the Month of September 2017 for
Chicago and Rockford...
At Chicago, the average high temperature was 79.7 degrees, which
is 4.9 degrees above normal. The average low temperature was 59.1
degrees, which is 4.8 degrees above normal. The average
temperature for the month was 69.4 degrees which is 4.8 degrees
above normal. During the month of September, 0.32 inches of
precipitation were recorded, which is 2.89 inches below normal.
Eight daily records were set for Chicago for the month of
September 2017:
* Record daily maximum temperatures on the 20th-26th.
* 9/20: 92 degrees
* 9/21: 94 degrees
* 9/22: 94 degrees
* 9/23: 95 degrees
* 9/24: 93 degrees
* 9/25: 92 degrees
* 9/26: 92 degrees
* Record daily highest minimum temperature of 72 degrees on the
23rd.
One Top Ten Monthly Record:
**Tied with 1891 for 4th driest December on record since 1872 with
0.32 inches.
At Rockford, the average high temperature was 79.1 degrees, which
is 3.7 degrees above normal. The average low temperature was 53.8
degrees, which is 1.4 degrees above normal. The average temperature
for the month was 66.5 degrees, which is 2.6 degrees above
normal. During the month of September, 0.51 inches of
precipitation were recorded, which is 2.84 inches below normal.
There were 2 daily records for Rockford for the month of
September 2017:
* Record daily highest minimum temperature of 67 degrees on the 22nd.
* Record daily maximum temperature of 93 degrees on the 23rd.
One Top Ten Monthly Record:
**Sixth driest September on record since 1905 with 0.51 inches.
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Castro/KMD
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