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Public Information Statement

Statement as of 10:42 PM EDT on September 23, 2017

Expires 10:45 AM EDT on September 24, 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 95* 91 (1937) 72* 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)

There has never been a heat wave of this duration and magnitude
this late in the season in Chicago. Chicago has never recorded
4 consecutive days with high temperatures 92f+ this late in the
year. The previous latest streak of 4+ days in a row of 92f+
was sept 16-19, 1955.

In addition, this is the latest Chicago has ever recorded 3 days
in a row of mid 90s (94f+). The previous record for latest 3+ day
streak of mid 90s was back on sept 13-15, 1927 and also the same
dates in 1939.

Saturday's high temperature of 95f tied for the hottest day of
2017. This sets a record for the latest in the year that the
hottest temperature of the year was recorded in Chicago.
Previously, the latest in the year that the annual high
temperature occurred was sept 14th back in 1893, 1915, and
also 1927.

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 93* 92 (1937) 66^ 66 (1920)
9/24 92 (1920) 70 (1930)
9/25 95 (1920) 69 (1972)

* = record
^ = record tied

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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