Yes

you do need a jacket based on the weather in Chicago, IL 60657, USA 1 second ago

Why? Because it's colder than a polar bear's pyjamas and it's fairly windy outside!
9°F-13°C & Windy

Wind is 15 mph24 km/h from the West, gusting to 24 mph38 km/h
January 20
2pm9°F-13°C15 mph24 km/h WestWindy
3pm10°F-12°C15 mph25 km/h WestWindy
4pm11°F-12°C15 mph25 km/h WestWindy
5pm11°F-12°C14 mph23 km/h WestMostly Cloudy
6pm10°F-12°C12 mph20 km/h WestMostly Cloudy
7pm9°F-13°C11 mph18 km/h WestMostly Cloudy
8pm9°F-13°C10 mph16 km/h WestMostly Cloudy
9pm7°F-14°C10 mph16 km/h NorthwestPartly Cloudy
10pm6°F-15°C11 mph17 km/h NorthwestMostly Cloudy
11pm4°F-15°C11 mph18 km/h NorthwestMostly Cloudy
January 21
12am3°F-16°C11 mph17 km/h NorthwestPartly Cloudy
1am1°F-17°C11 mph17 km/h NorthwestPartly Cloudy
DateLowHighWindDayNight
January 201°F-17°C11°F-12°C12 mph20 km/h from WestPartly CloudyPartly Cloudy
January 21-7°F-22°C2°F-17°C10 mph16 km/h from WestClearPartly Cloudy
January 22-1°F-18°C22°F-6°C12 mph19 km/h from SouthCloudyCloudy
January 2314°F-10°C23°F-5°C7 mph11 km/h from NorthwestMostly CloudyMostly Clear
January 2410°F-12°C24°F-4°C7 mph10 km/h from SouthwestPartly CloudyCloudy
January 2521°F-6°C32°F-0°C9 mph14 km/h from SouthwestCloudyCloudy
January 2618°F-8°C27°F-3°C8 mph13 km/h from WestMostly CloudyPartly Cloudy

Yes

Low of -7°F-22°C, High of 2°F-17°C
Wind: 10 mph16 km/h
Precipitation: None

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