Yes

you do need a jacket based on the weather in Chalfont, PA 18914, USA 1 second ago

Why? Because it's colder than a polar bear's pyjamas!
22°F-6°C & Cloudy

Wind is 3 mph5 km/h from the South, gusting to 11 mph17 km/h
December 23
10pm22°F-6°C4 mph6 km/h SouthCloudy
11pm22°F-6°C4 mph7 km/h SouthCloudy
December 24
12am22°F-6°C4 mph7 km/h SouthCloudy
1am22°F-6°C3 mph5 km/h SouthwestCloudy
2am22°F-6°C3 mph5 km/h SouthwestCloudy
3am22°F-6°C4 mph6 km/h SouthwestCloudy
4am22°F-6°C4 mph6 km/h SouthwestCloudy
5am22°F-5°C4 mph6 km/h SouthwestCloudy
6am23°F-5°C4 mph7 km/h SouthwestCloudy
7am24°F-4°C4 mph7 km/h SouthwestSnow
8am25°F-4°C4 mph7 km/h WestSnow
9am26°F-3°C5 mph8 km/h WestCloudy
DateLowHighWindDayNight
December 233°F-16°C26°F-3°C1 mph1 km/h from SoutheastMostly ClearSnow
December 2422°F-6°C39°F4°C5 mph8 km/h from WestSnowPartly Cloudy
December 2523°F-5°C36°F2°C3 mph6 km/h from NorthPartly CloudyMostly Cloudy
December 2623°F-5°C37°F3°C2 mph4 km/h from NorthPartly CloudyMostly Clear
December 2721°F-6°C40°F4°C2 mph4 km/h from NortheastPartly CloudyMostly Cloudy
December 2830°F-1°C41°F5°C4 mph6 km/h from EastMostly CloudyDrizzle
December 2935°F2°C52°F11°C9 mph14 km/h from EastRainRain

Yes

Low of 22°F-6°C, High of 39°F4°C
Wind: 5 mph8 km/h
Precipitation: 53% snow

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