Yes

you do need a jacket based on the weather in Plymouth Meeting, PA 19462, USA 1 second ago

Why? Because it's bitterly cold.
47°F8°C & Clear

Wind is 11 mph18 km/h from the NW, gusting to 25 mph40 km/h
March 29
11am48°F9°C12 mph20 km/h NWClear
12pm50°F10°C14 mph22 km/h NWClear
1pm52°F11°C14 mph23 km/h NWMostly Clear
2pm53°F12°C15 mph24 km/h NWMostly Clear
3pm54°F12°C15 mph25 km/h NWWindy
4pm54°F12°C15 mph25 km/h NWWindy
5pm54°F12°C15 mph24 km/h NWWindy
6pm52°F11°C14 mph23 km/h NWMostly Clear
7pm50°F10°C12 mph20 km/h NWClear
8pm46°F8°C9 mph15 km/h NWClear
9pm44°F7°C8 mph13 km/h NWClear
10pm42°F6°C8 mph13 km/h NWClear
DateLowHighWindDayNight
March 2937°F3°C54°F12°C12 mph20 km/h from NWMostly ClearClear
March 3034°F1°C59°F15°C9 mph15 km/h from WPartly CloudyMostly Cloudy
March 3146°F8°C60°F16°C8 mph13 km/h from NWMostly CloudyRain
April 143°F6°C50°F10°C7 mph11 km/h from ERainRain
April 242°F5°C47°F9°C10 mph16 km/h from ERainRain
April 339°F4°C50°F10°C8 mph14 km/h from NERainDrizzle
April 437°F3°C49°F9°C14 mph23 km/h from NWMostly CloudyPartly Cloudy

Yes

Low of 34°F1°C, High of 59°F15°C
Wind: 9 mph15 km/h
Precipitation: None

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