Yes

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

Why? Because the cold's there, but it's just a reminder, not an invasion!
38°F4°C & Cloudy

Wind is 6 mph9 km/h from the West, gusting to 11 mph18 km/h
November 23
10am39°F4°C6 mph9 km/h WestCloudy
11am40°F5°C6 mph9 km/h WestCloudy
12pm42°F6°C6 mph9 km/h WestCloudy
1pm44°F6°C6 mph10 km/h WestCloudy
2pm45°F7°C7 mph11 km/h WestMostly Cloudy
3pm46°F8°C7 mph12 km/h WestMostly Cloudy
4pm45°F7°C7 mph11 km/h WestMostly Cloudy
5pm44°F7°C6 mph10 km/h WestMostly Cloudy
6pm43°F6°C5 mph8 km/h SouthwestMostly Cloudy
7pm42°F6°C5 mph8 km/h SouthwestCloudy
8pm41°F5°C5 mph8 km/h SouthwestCloudy
9pm40°F5°C4 mph7 km/h SouthwestCloudy
DateLowHighWindDayNight
November 2338°F3°C46°F8°C6 mph10 km/h from WestCloudyCloudy
November 2436°F2°C53°F11°C6 mph10 km/h from SouthMostly CloudyCloudy
November 2531°F-1°C51°F11°C9 mph15 km/h from NorthwestDrizzlePartly Cloudy
November 2625°F-4°C37°F3°C9 mph14 km/h from WestMostly ClearMostly Cloudy
November 2729°F-2°C39°F4°C3 mph5 km/h from SoutheastMostly CloudyMostly Cloudy
November 2830°F-1°C40°F5°C6 mph10 km/h from NorthMostly CloudyMostly Cloudy
November 2922°F-6°C35°F1°C10 mph16 km/h from WestPartly CloudyMostly Clear

Yes

Low of 37°F3°C, High of 53°F12°C
Wind: 6 mph10 km/h
Precipitation: None

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