Public Information Statement
Issued by NWS Chicago, IL

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Public Information Statement
National Weather Service Chicago IL
439 AM CDT Fri Jun 9 2017 /539 AM EDT Fri Jun 9 2017/

...How Common Are Early Season Stretches of 90 Degree Weather?...

Early season heat with afternoon temperatures in the 90s is
forecast for at least a three to four day stretch from this
weekend into early next week. Below is a look at how common such
an early season stretch is for the area`s long term climate sites.

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CHICAGO

Since 1872, only nine years have had four or more consecutive
days in the 90s prior to the midpoint of June (on or before June
15). The most recent was 18 years ago on June 8-11, 1999. The
earliest on record was May 3-6, 1949, while the longest early
season stretch was 9 days from May 16-24, 1977.

Years with 4+ consecutive 90 degree days prior to June`s midpoint:
1920, 1921, 1934, 1949, 1956, 1962, 1977, 1988, and 1999.

It should be noted that early season stretches of just 3
consecutive 90 degree days are much more common. The most recent
was June 9-11, 2012.

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ROCKFORD

Since 1906, only six years have had four or more consecutive days
in the 90s prior to the midpoint of June (on or before June 15).
The most recent was over a half century ago, on June 6-9, 1963.
The earliest on record was May 17-21, 1934, while the longest
early season stretch was 8 days that same year, from May 29-June
5, 1934.

Years with 4+ consecutive 90 degree days prior to June`s midpoint:
1921, 1933, 1934, 1943, 1956, and 1963 (1934 had two stretches).

It should be noted that early season stretches of just 3
consecutive 90 degree days are much more common. The most recent
was June 6-8, 2011.

$$

MTF



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