Yes

you do need a jacket based on the weather in Delavan, WI, USA 1 second ago

Why? Because it's not very warm out!
53°F12°C & Mostly Cloudy

Wind is 7 mph12 km/h from the Northwest, gusting to 15 mph24 km/h
November 8
12am51°F11°C9 mph15 km/h NorthwestDrizzle
1am48°F9°C9 mph15 km/h NorthwestPartly Cloudy
2am47°F8°C11 mph18 km/h NorthMostly Cloudy
3am46°F8°C10 mph16 km/h NorthMostly Cloudy
4am45°F7°C9 mph14 km/h NorthMostly Cloudy
5am44°F7°C8 mph13 km/h NorthMostly Cloudy
6am43°F6°C8 mph14 km/h NorthCloudy
7am42°F5°C8 mph12 km/h NorthMostly Cloudy
8am41°F5°C8 mph13 km/h NorthCloudy
9am40°F5°C8 mph13 km/h NortheastMostly Cloudy
10am39°F4°C8 mph12 km/h NortheastMostly Cloudy
11am38°F3°C7 mph12 km/h NortheastMostly Cloudy
DateLowHighWindDayNight
November 743°F6°C59°F15°C13 mph20 km/h from WestRainMostly Cloudy
November 834°F1°C44°F6°C8 mph14 km/h from NortheastDrizzleSnow
November 926°F-4°C34°F1°C17 mph28 km/h from NorthwestWindyWindy
November 1023°F-5°C36°F2°C14 mph23 km/h from NorthwestPartly CloudyMostly Cloudy
November 1126°F-3°C42°F5°C15 mph24 km/h from SouthwestWindyPartly Cloudy
November 1236°F2°C48°F9°C16 mph26 km/h from WestWindyMostly Clear
November 1331°F-0°C44°F7°C12 mph19 km/h from WestPartly CloudyPartly Cloudy

Yes

Low of 34°F1°C, High of 44°F7°C
Wind: 8 mph14 km/h
Precipitation: 60% rain

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