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Before what looks to be a perfect fall weekend gets rolling, here comes the season’s first freeze warning.

A freeze warning means it’s highly likely to see sub-freezing temperatures, which can harm crops or other sensitive plants. This freeze warning is unusual for the suddenness of its spread, said Matt Friedlein, meteorologist with the National Weather Service in Romeoville. The entire area, from Rockford through downtown could get its first freeze all at once, while the northwest part of the state usually sees the first freeze earlier (early October), O’Hare International Airport about now (Oct. 13) and Midway later (Oct. 23), Friedlein said.

Temperatures could dip below freezing Saturday night too, but the NWS usually suspends freeze warnings after issuing the first of the fall.

Friday’s forecast points to 50s through evening rush hour and dropping into the freeze warning at night. The National Weather Service says temperatures will quickly fall into the 30s and, in outlying areas, bottom out in the 20s. The freeze warning will stay in effect until 9 a.m. Saturday.

Saturday the Cubs will be in New York (highs forecast in the 50s), and Sunday the Bears will be in Detroit (50s and possible showers), weekend temperatures here should be chillier on Saturday, and rising Sunday and Monday.

It looks to be an October weekend perfect for pumpkin farming, haunted house going, college football attending or, ahem, raking leaves.

Though the Climate Prediction Center said Thursday that chances are increasing for a milder winter with below-normal precipitation, winter is still winter, fall is still fall, and temperatures will still get chillier, at least through 9 a.m. Saturday.


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The weekend ahead

Low temperature

High temperature

Normal range

Record

Forecast

Forecast

Record

SATURDAY, Oct. 17

Mostly sunny, but cool and clear

Temperatures

26°

34°

50°

86°

0

10

20

30

40

50

60

70

80

90

SUNDAY, Oct. 18

Clear, frosty morning conditions

20°

42°

58°

87°

0

10

20

30

40

50

60

70

80

90

100

MONDAY, Oct. 19

Partly cloudy, windy

21°

53°

71°

84°

0

10

20

30

40

50

60

70

80

90

100

The season so far

Daily temperatures Sept. 1 to Nov. 30 Recorded at O’Hare International Airport

Daily high

Daily low

Normal range

Highest high: 92, Sept. 6

Lowest lows: 42, Oct. 10 and 14

SEPTEMBER

OCTOBER

NOVEMBER

Daily precipitation Sept. 1 to Nov. 30 In inches, trace amounts not shown

High: 2.4 inches, Sept. 18

NOVEMBER

SEPTEMBER

OCTOBER

October records

94°

14°

3.94 in.

3.8 in.

The record high for October, recorded on the 6th in 1963

Record low for October, recorded on the 25th in 1887

Record precipitation, recorded for the 13th in 2001

Record amount of snow, recorded on the 19th, in 1989

The year in review

Monthly average temperatures

72.3

71.8

69

67.3

60.4

57.7

52

49.4

35.4

33.6

32

22.3

14.6

Oct.

Nov.

Dec.

Jan.

Feb.

March

April

May

June

July

Aug.

Sept.

Oct.

2014

2015

Departure from normal average temperature

+4.4

+4.3

+2.3

+1.3

+0.5

-0.6

-0.5

-1.5

-1.7

-1.6

-2.5

-6.7

-13.1

Oct.

Nov.

Dec.

Jan.

Feb.

March

April

May

June

July

Aug.

Sept.

Oct.

2014

2015

Looking ahead

The latest NOAA temperature outlook for the Chicago area shows an increased chance of a warmer-than-normal winter as well as an increased chance of less-than-normal precipitation. NOAA attributes this outlook on El Nino, a warming of the surface of the Pacific Ocean. Although this warming of ocean water will occur thousands of miles away, a shift in ocean temperatures changes weather patterns around the globe. In a typical El Nino event, Northern states often get warmer while Southern states often get wetter.

THREE MONTH WEATHER OUTLOOK For December, January and February, as of Oct. 15

PRECIPITATION

TEMPERATURE

Equal

Equal

Higher precip.

Lower precip.

Higher temp.

Lower temp.

33%

33%

80%

33%

80%

80%

33%

Chicago

Chicago


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The weekend ahead

Low temperature

Forecast

Record

Normal range

High temperature

Forecast

Record

SATURDAY, Oct. 17

Mostly sunny, but cool

Temps

50°

86°

26°

34°

0

10

20

30

40

50

60

70

80

90

SATURDAY, Oct. 18

Clear

20°

87°

42°

58°

0

10

20

30

40

50

60

70

80

90

MONDAY, Oct. 19

Partly cloudy

21°

84°

53°

71°

0

10

20

30

40

50

60

70

80

90

The season so far

Daily temperatures Sept. 1 to Nov. 30

Recorded at O’Hare International Airport

Daily

high

Daily

low

Normal

range

Highest high: 92, Sept. 6

Lowest lows: 42, Oct. 10 and 14

SEPT.

OCT.

NOV.

Daily precipitation Sept. 1 to Nov. 30

In inches, trace amounts not shown

High: 2.4 inches, Sept. 18

NOV.

SEPT.

OCT.

The year in review

Monthly average temperatures

Oct. 2015: 57.7

O

N

D

J

F

M

A

M

J

J

A

S

O

2014

2015

Departure from normal average temperature

+2.3

O

N

D

J

F

M

A

M

J

J

A

S

O

2014

2015

October records

The record high for October, recorded on the 6th in 1963

Record low for October, recorded on the 25th in 1887

14°

Record precipitation, recorded for the 13th in 2001

3.94

Record amount of snow, recorded on the 19th, in 1989

3.8

Looking ahead

The latest NOAA temperature outlook for the Chicago area shows an increased chance of a warmer-than-normal winter as well as an increased chance of less-than-normal precipitation. NOAA attributes this outlook on El Nino, a warming of the surface of the Pacific Ocean. Although this warming of ocean water will occur thousands of miles away, a shift in ocean temperatures changes weather patterns around the globe. In a typical El Nino event, Northern states often get warmer while Southern states often get wetter.

THREE MONTH WEATHER OUTLOOK

For December, January and February,

as of Oct. 15

PRECIPITATION

Equal

Higher precip.

Lower precip.

33%

80%

33%

80%

Chicago

TEMPERATURE

Equal

Higher temp.

Lower temp.

33%

80%

80%

33%

Chicago

Sources: NOAA/National Weather Service, WGN meteorologist Tom Skilling

@ChiTribGraphics