Yes

you do need a jacket based on the weather in Rockville, MD 20850, USA 1 second ago

Why? Because it's bitterly cold.
47°F9°C & Mostly Clear

Wind is 6 mph9 km/h from the E, gusting to 12 mph20 km/h
April 26
9am48°F9°C6 mph9 km/h EPartly Cloudy
10am51°F11°C6 mph10 km/h EPartly Cloudy
11am55°F13°C7 mph11 km/h EMostly Clear
12pm59°F15°C8 mph13 km/h SEMostly Clear
1pm61°F16°C8 mph13 km/h SEPartly Cloudy
2pm63°F17°C9 mph14 km/h SEPartly Cloudy
3pm64°F18°C8 mph13 km/h SEMostly Clear
4pm65°F18°C8 mph13 km/h SEMostly Clear
5pm64°F18°C9 mph14 km/h SEMostly Clear
6pm63°F17°C9 mph14 km/h SEMostly Clear
7pm60°F16°C8 mph13 km/h SEPartly Cloudy
8pm57°F14°C8 mph12 km/h SEPartly Cloudy
DateLowHighWindDayNight
April 2640°F4°C65°F18°C7 mph12 km/h from SEPartly CloudyPartly Cloudy
April 2742°F6°C61°F16°C8 mph13 km/h from SECloudyMostly Cloudy
April 2850°F10°C82°F28°C6 mph9 km/h from SWMostly ClearMostly Clear
April 2958°F15°C88°F31°C4 mph7 km/h from WMostly ClearMostly Clear
April 3063°F17°C86°F30°C7 mph11 km/h from WPartly CloudyMostly Clear
May 160°F16°C82°F28°C5 mph8 km/h from WPartly CloudyPartly Cloudy
May 259°F15°C82°F28°C8 mph12 km/h from SWMostly ClearPartly Cloudy

Yes

Low of 43°F6°C, High of 61°F16°C
Wind: 8 mph13 km/h
Precipitation: 28% rain

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