Public Information Statement
Issued by NWS Chicago, IL

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Public Information Statement
National Weather Service Chicago IL
158 AM CDT Sat Sep 23 2017 /258 AM EDT Sat Sep 23 2017/

...Record Late Season Heat Numbers...

Late September 2017 is seeing near to record warmth across a
sizable portion of the Midwest, including northern Illinois and
northwest Indiana. Following are climatological numbers to put
this ongoing late season heat into perspective.

**************************************************************
CHICAGO

Records date back to 1871.

Date   2017 High   Record High   2017 Low  Record Warm Minimum
--------------------------------------------------------------
9/20      92*       91 (1931)       62         73 (1931)
9/21      94*       92 (1970)       72         76 (1931)
9/22      94*       92 (1956)       71         73 (1895)
9/23                91 (1937)                  71 (1891)
9/24                91 (1891)                  71 (1930)
9/25                90 (1933)                  76 (1931)

* = Record

2017 has seen the latest 90+ since 2007 (Sept 24).

Latest 90+ degree reading on record:  Oct 6, 1963 (94)
Latest 95+ degree reading on record:  Sept 29, 1953 (99)

This has been the second latest stretch of three or more
consecutive 90+ days:

1. Sept 30-Oct 2, 1971
2. Sept 20-22, 2017
   Sept 19-22, 1895

The latest in the year that the annual high temperature
occurred:  Sept 14 in 1893, 1915, and 1927.

The highest temperature in 2017 has been 95 on June 12.

The daily average temperature on Sept 21 was 83 degrees, which
ties for the warmest daily temperature on record after the
midpoint of Sept (Sept 21, 1931).


**************************************************************
ROCKFORD

Records date back to 1905.

Date   2017 High   Record High   2017 Low  Record Warm Minimum
--------------------------------------------------------------
9/20      91        92 (1920)       63          74 (1895)
9/21      89        94 (1920)       69          70 (1895)
9/22      92        93 (1937)       67*         65 (1959)
9/23                92 (1937)                   66 (1920)
9/24                92 (1920)                   70 (1930)
9/25                95 (1920)                   69 (1972)

* = Record

2017 has seen the latest 90+ since 2010 (Oct 9).

Latest 90+ degree reading on record:  Oct 9, 2010 (90)
Latest 95+ degree reading on record:  Sept 25, 1920 (95)

Latest stretches of 2+ consecutive days of 90+:
1. Oct 2-5, 1922
2. Sept 30-Oct 1, 1971
3. Sept 24-26, 1920
4. Sept 22-23, 1937

The latest in the year that the annual high temperature
occurred:  Sept 15, 1927 (99)

The highest temperature in 2017 has been 94 on June 11 and 12.


For more, please see weather.gov/chicago and click on Climate
and Past Weather.

$$



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