Yes

you do need a jacket based on the weather in Ann Arbor, MI, USA 1 second ago

Why? Because it's cold. simple as that.
41°F5°C & Cloudy

Wind is 4 mph7 km/h from the N, gusting to 8 mph13 km/h
December 2
2pm41°F5°C5 mph7 km/h NCloudy
3pm41°F5°C5 mph8 km/h NECloudy
4pm41°F5°C5 mph7 km/h NECloudy
5pm40°F5°C4 mph7 km/h NECloudy
6pm40°F4°C5 mph8 km/h NECloudy
7pm40°F4°C5 mph8 km/h NECloudy
8pm39°F4°C6 mph9 km/h NECloudy
9pm39°F4°C6 mph10 km/h NECloudy
10pm38°F3°C6 mph9 km/h NECloudy
11pm37°F3°C6 mph9 km/h NECloudy
December 3
12am37°F3°C5 mph9 km/h NECloudy
1am36°F2°C6 mph9 km/h NECloudy
DateLowHighWindDayNight
December 237°F3°C41°F5°C5 mph8 km/h from NECloudyDrizzle
December 335°F2°C44°F6°C8 mph13 km/h from SWRainCloudy
December 433°F0°C39°F4°C9 mph14 km/h from NWMostly CloudyCloudy
December 531°F-1°C38°F3°C6 mph10 km/h from EFlurriesPartly Cloudy
December 627°F-3°C37°F3°C8 mph12 km/h from NWPartly CloudyCloudy
December 730°F-1°C44°F7°C9 mph15 km/h from SMostly CloudyMostly Cloudy
December 838°F3°C48°F9°C13 mph22 km/h from WCloudyCloudy

Yes

Low of 36°F2°C, High of 44°F7°C
Wind: 8 mph13 km/h
Precipitation: 76% rain

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