Public Information Statement
Issued by NWS Chicago, IL

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Public Information Statement
National Weather Service Chicago IL
344 AM CDT Fri Sep 22 2017 /444 AM EDT Fri Sep 22 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                92 (1956)                  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)

Latest stretches of 3+ consecutive days of 90+:
1. Sept 30-Oct 2, 1971
2. Sept 19-22, 1895

Latest the annual high temperature occurred:  Sept 14 in 1893,
1915, and 1927.

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


**************************************************************
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                93 (1937)                   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

Latest the high temperature in a year 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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