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Public Information Statement
Issued: 4:44 AM EDT Sep. 22, 2017 – National Weather Service

... 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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