Yes

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

Why? Because it's quite chilly.
40°F5°C & Clear

Wind is 7 mph12 km/h from the NW, gusting to 18 mph29 km/h
March 29
3am40°F5°C8 mph12 km/h NWClear
4am38°F4°C6 mph10 km/h NWClear
5am37°F3°C6 mph9 km/h NWClear
6am36°F2°C5 mph9 km/h NWClear
7am36°F2°C5 mph8 km/h WMostly Clear
8am38°F3°C5 mph8 km/h WMostly Clear
9am42°F6°C6 mph10 km/h WMostly Clear
10am46°F8°C8 mph13 km/h NWMostly Clear
11am49°F10°C11 mph18 km/h NWPartly Cloudy
12pm52°F11°C14 mph22 km/h NWMostly Clear
1pm55°F13°C15 mph24 km/h NWMostly Clear
2pm57°F14°C16 mph25 km/h NWWindy
DateLowHighWindDayNight
March 2936°F2°C59°F15°C12 mph19 km/h from NWMostly ClearClear
March 3037°F3°C62°F17°C5 mph9 km/h from SWMostly CloudyPartly Cloudy
March 3149°F9°C66°F19°C6 mph10 km/h from NWMostly CloudyRain
April 147°F8°C56°F13°C7 mph11 km/h from ERainRain
April 246°F8°C60°F16°C6 mph9 km/h from SERainRain
April 342°F6°C55°F13°C10 mph17 km/h from NWRainMostly Cloudy
April 438°F4°C51°F11°C18 mph29 km/h from NWWindyMostly Clear

Yes

Low of 37°F3°C, High of 62°F17°C
Wind: 5 mph9 km/h
Precipitation: 24% rain

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