Yes

you do need a jacket based on the weather in West Chester, PA 19383, USA 1 second ago

Why? Because it's cold. simple as that.
43°F6°C & Clear

Wind is 10 mph16 km/h from the NW, gusting to 24 mph38 km/h
March 29
10am45°F7°C11 mph18 km/h NWClear
11am47°F9°C13 mph21 km/h NWClear
12pm50°F10°C14 mph23 km/h NWMostly Clear
1pm51°F11°C14 mph23 km/h NWClear
2pm53°F11°C15 mph24 km/h NWMostly Clear
3pm53°F12°C15 mph25 km/h NWWindy
4pm54°F12°C15 mph25 km/h NWWindy
5pm54°F12°C15 mph24 km/h NWClear
6pm52°F11°C13 mph21 km/h NWClear
7pm50°F10°C11 mph18 km/h NWClear
8pm47°F8°C9 mph14 km/h NWClear
9pm44°F7°C8 mph13 km/h NWClear
DateLowHighWindDayNight
March 2938°F3°C54°F12°C13 mph21 km/h from NWClearClear
March 3034°F1°C59°F15°C8 mph13 km/h from WPartly CloudyMostly Cloudy
March 3147°F8°C60°F16°C8 mph12 km/h from NWMostly CloudyRain
April 144°F7°C51°F10°C7 mph11 km/h from ERainRain
April 242°F6°C49°F9°C9 mph14 km/h from ERainRain
April 340°F5°C49°F10°C8 mph12 km/h from NRainDrizzle
April 436°F2°C48°F9°C16 mph25 km/h from NWWindyPartly Cloudy

Yes

Low of 34°F1°C, High of 59°F15°C
Wind: 8 mph13 km/h
Precipitation: 24% rain

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