Yes

you do need a jacket based on the weather in Chelsea, MA 02150, USA 1 second ago

Why? Because the temperature has dropped below freezing!
13°F-10°C & Mostly Clear

Wind is 7 mph12 km/h from the Northwest, gusting to 17 mph27 km/h
December 22
9pm13°F-11°C8 mph12 km/h NorthwestClear
10pm12°F-11°C7 mph12 km/h NorthwestClear
11pm12°F-11°C7 mph11 km/h NorthwestClear
December 23
12am11°F-12°C7 mph11 km/h NorthwestClear
1am11°F-12°C6 mph10 km/h NorthwestClear
2am10°F-12°C6 mph10 km/h NorthwestClear
3am10°F-12°C6 mph9 km/h NorthwestClear
4am10°F-12°C6 mph9 km/h NorthwestClear
5am10°F-12°C5 mph9 km/h NorthwestClear
6am10°F-12°C5 mph8 km/h NorthwestClear
7am11°F-12°C5 mph7 km/h NorthwestMostly Clear
8am12°F-11°C4 mph7 km/h NorthwestMostly Clear
DateLowHighWindDayNight
December 2210°F-12°C20°F-7°C6 mph9 km/h from NorthwestClearClear
December 2310°F-12°C26°F-3°C5 mph7 km/h from SouthwestMostly ClearMostly Cloudy
December 2422°F-6°C34°F1°C7 mph11 km/h from WestMostly CloudyMostly Clear
December 2520°F-7°C31°F-0°C6 mph10 km/h from NorthMostly ClearPartly Cloudy
December 2624°F-4°C33°F1°C5 mph8 km/h from NorthMostly CloudyMostly Clear
December 2724°F-5°C36°F2°C3 mph6 km/h from NorthwestMostly ClearMostly Clear
December 2823°F-5°C36°F2°C2 mph3 km/h from NorthPartly CloudyMostly Cloudy

Yes

Low of 10°F-13°C, High of 27°F-3°C
Wind: 5 mph7 km/h
Precipitation: None

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