Yes

you do need a jacket based on the weather in Frederick, MD, USA 1 second ago

Why? Because it's bitterly cold.
48°F9°C & Mostly Clear

Wind is 12 mph19 km/h from the NW, gusting to 27 mph43 km/h
March 29
11am49°F9°C14 mph23 km/h NWMostly Clear
12pm51°F11°C16 mph25 km/h NWWindy
1pm53°F12°C17 mph27 km/h NWWindy
2pm55°F13°C17 mph28 km/h NWWindy
3pm56°F13°C18 mph28 km/h NWWindy
4pm56°F13°C17 mph28 km/h NWWindy
5pm55°F13°C17 mph27 km/h NWWindy
6pm54°F12°C15 mph24 km/h NWWindy
7pm51°F11°C12 mph19 km/h NWClear
8pm48°F9°C9 mph14 km/h NWClear
9pm46°F8°C8 mph13 km/h NWClear
10pm45°F7°C7 mph12 km/h NWClear
DateLowHighWindDayNight
March 2936°F2°C56°F13°C13 mph21 km/h from NWClearClear
March 3036°F2°C60°F15°C6 mph10 km/h from SWRainPartly Cloudy
March 3150°F10°C65°F18°C6 mph10 km/h from NWMostly CloudyRain
April 147°F8°C55°F13°C7 mph11 km/h from ERainRain
April 245°F7°C54°F12°C6 mph10 km/h from SERainRain
April 341°F5°C56°F13°C10 mph15 km/h from NWRainRain
April 438°F4°C48°F9°C17 mph28 km/h from NWWindyPartly Cloudy

Yes

Low of 36°F2°C, High of 60°F16°C
Wind: 6 mph10 km/h
Precipitation: 33% rain

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