Yes

you do need a jacket based on the weather in Chicago, IL, USA 53 seconds ago

Why? Because this drizzle is just a polite way of saying, “Get ready, the big stuff's coming.” and there's a refreshing nip in the air and the wind is offering free, unsolicited face massages!
49°F9°C & Drizzle

Wind is 11 mph18 km/h from the South, gusting to 23 mph37 km/h
December 28
12am49°F10°C12 mph19 km/h SouthDrizzle
1am49°F9°C14 mph22 km/h SouthwestDrizzle
2am48°F9°C15 mph24 km/h SouthwestWindy
3am47°F8°C14 mph22 km/h SouthwestCloudy
4am47°F8°C14 mph22 km/h SouthwestCloudy
5am46°F8°C13 mph21 km/h SouthwestCloudy
6am45°F7°C13 mph21 km/h SouthwestCloudy
7am45°F7°C13 mph21 km/h SouthwestCloudy
8am44°F7°C13 mph20 km/h SouthwestCloudy
9am44°F6°C12 mph19 km/h SouthwestMostly Cloudy
10am44°F7°C12 mph19 km/h SouthwestMostly Cloudy
11am45°F7°C11 mph18 km/h SouthwestCloudy
DateLowHighWindDayNight
December 2742°F6°C49°F10°C8 mph13 km/h from SoutheastDrizzleDrizzle
December 2841°F5°C50°F10°C9 mph14 km/h from SouthwestCloudyDrizzle
December 2935°F2°C43°F6°C12 mph19 km/h from NorthRainDrizzle
December 3033°F1°C43°F6°C5 mph8 km/h from SouthwestMostly CloudyCloudy
December 3132°F0°C40°F4°C10 mph16 km/h from NorthDrizzleSnow
January 123°F-5°C32°F0°C12 mph19 km/h from WestCloudyMostly Cloudy
January 220°F-7°C27°F-3°C11 mph17 km/h from WestMostly ClearPartly Cloudy

Yes

Low of 41°F5°C, High of 50°F10°C
Wind: 9 mph14 km/h
Precipitation: None

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