Yes

you do need a jacket based on the weather in Cambridge, MA 02139, USA 1 second ago

Why? Because it's snowing and it's cold enough to freeze the brass off a bald monkey!
31°F-1°C & Snow

Wind is 9 mph14 km/h from the North, gusting to 17 mph28 km/h
January 11
3pm31°F-1°C9 mph15 km/h NorthSnow
4pm30°F-1°C9 mph14 km/h NorthSnow
5pm29°F-2°C9 mph14 km/h NorthCloudy
6pm29°F-2°C8 mph13 km/h NorthwestCloudy
7pm28°F-2°C8 mph13 km/h NorthwestCloudy
8pm27°F-3°C7 mph12 km/h NorthwestCloudy
9pm26°F-3°C9 mph14 km/h NorthwestMostly Cloudy
10pm26°F-3°C9 mph15 km/h NorthwestPartly Cloudy
11pm25°F-4°C10 mph16 km/h NorthwestPartly Cloudy
January 12
12am24°F-4°C10 mph17 km/h NorthwestMostly Clear
1am24°F-5°C10 mph17 km/h NorthwestClear
2am23°F-5°C11 mph17 km/h NorthwestClear
DateLowHighWindDayNight
January 1124°F-4°C31°F-1°C5 mph8 km/h from NorthSnowMostly Clear
January 1222°F-5°C36°F2°C6 mph10 km/h from NorthwestMostly ClearMostly Cloudy
January 1324°F-4°C39°F4°C4 mph6 km/h from SouthwestPartly CloudyPartly Cloudy
January 1422°F-6°C33°F1°C11 mph17 km/h from WestMostly ClearPartly Cloudy
January 1517°F-8°C29°F-2°C12 mph20 km/h from NorthwestMostly ClearClear
January 1614°F-10°C29°F-2°C6 mph10 km/h from WestPartly CloudyMostly Clear
January 1720°F-7°C34°F1°C6 mph9 km/h from SouthwestMostly ClearPartly Cloudy

Yes

Low of 22°F-6°C, High of 36°F2°C
Wind: 6 mph10 km/h
Precipitation: None

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