Yes

you do need a jacket based on the weather in Galloway, NJ, USA 1 second ago

Why? Because you're not freezing, but you’ll definitely start complaining if it lasts much longer!
34°F1°C & Mostly Cloudy

Wind is 6 mph9 km/h from the Northwest, gusting to 12 mph19 km/h
December 13
5pm33°F0°C6 mph9 km/h NorthPartly Cloudy
6pm31°F-1°C6 mph10 km/h NorthPartly Cloudy
7pm29°F-2°C6 mph10 km/h NorthPartly Cloudy
8pm28°F-2°C6 mph10 km/h NorthPartly Cloudy
9pm27°F-3°C6 mph9 km/h NorthMostly Cloudy
10pm26°F-3°C6 mph9 km/h NorthMostly Cloudy
11pm26°F-4°C6 mph9 km/h NorthMostly Cloudy
December 14
12am25°F-4°C6 mph10 km/h NorthMostly Cloudy
1am25°F-4°C6 mph10 km/h NorthPartly Cloudy
2am24°F-4°C7 mph11 km/h NorthPartly Cloudy
3am23°F-5°C7 mph11 km/h NorthPartly Cloudy
4am23°F-5°C7 mph11 km/h NorthPartly Cloudy
DateLowHighWindDayNight
December 1319°F-7°C38°F3°C4 mph7 km/h from NorthwestMostly ClearPartly Cloudy
December 1423°F-5°C39°F4°C7 mph12 km/h from NortheastMostly ClearPartly Cloudy
December 1526°F-3°C44°F6°C6 mph10 km/h from EastCloudyDrizzle
December 1641°F5°C52°F11°C7 mph11 km/h from SoutheastRainRain
December 1741°F5°C61°F16°C10 mph16 km/h from WestRainMostly Clear
December 1835°F2°C50°F10°C3 mph6 km/h from EastMostly CloudyDrizzle
December 1937°F3°C46°F8°C10 mph16 km/h from NorthDrizzleDrizzle

Yes

Low of 23°F-5°C, High of 39°F4°C
Wind: 7 mph12 km/h
Precipitation: None

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