Yes

you do need a jacket based on the weather in Windsor, IL 61465, USA 1 second ago

Why? Because it's quite chilly!
34°F1°C & Partly Cloudy

Wind is 6 mph9 km/h from the Northwest, gusting to 12 mph20 km/h
December 23
11pm34°F1°C6 mph9 km/h NorthwestMostly Cloudy
December 24
12am34°F1°C6 mph9 km/h NorthMostly Cloudy
1am34°F1°C5 mph8 km/h NorthCloudy
2am34°F1°C5 mph8 km/h NorthCloudy
3am34°F1°C5 mph7 km/h NorthCloudy
4am33°F1°C5 mph8 km/h NorthCloudy
5am33°F0°C6 mph10 km/h NortheastCloudy
6am32°F0°C7 mph11 km/h NortheastCloudy
7am32°F-0°C7 mph12 km/h NortheastCloudy
8am31°F-0°C7 mph12 km/h NortheastCloudy
9am31°F-1°C8 mph13 km/h NortheastCloudy
10am32°F-0°C9 mph14 km/h NortheastCloudy
DateLowHighWindDayNight
December 2332°F0°C47°F8°C12 mph20 km/h from SouthwestMostly CloudyMostly Cloudy
December 2431°F-1°C39°F4°C7 mph11 km/h from NortheastCloudyCloudy
December 2532°F0°C41°F5°C9 mph14 km/h from EastCloudyCloudy
December 2637°F3°C48°F9°C8 mph13 km/h from SoutheastDrizzleDrizzle
December 2742°F5°C49°F10°C11 mph17 km/h from SoutheastRainCloudy
December 2841°F5°C51°F11°C10 mph15 km/h from SouthwestCloudyMostly Cloudy
December 2937°F3°C45°F7°C10 mph16 km/h from WestPartly CloudyPartly Cloudy

Yes

Low of 31°F-1°C, High of 39°F4°C
Wind: 7 mph11 km/h
Precipitation: None

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