Yes

you do need a jacket based on the weather in McLean, VA, USA 1 second ago

Why? Because it's pretty chilly and it's so windy, your hat is now someone else's problem, two cities away!
52°F11°C & Windy

Wind is 16 mph26 km/h from the Northwest, gusting to 30 mph48 km/h
March 17
5pm51°F11°C16 mph26 km/h NorthwestWindy
6pm50°F10°C15 mph24 km/h NorthwestWindy
7pm48°F9°C13 mph21 km/h NorthwestMostly Clear
8pm46°F8°C13 mph20 km/h NorthwestClear
9pm44°F7°C12 mph19 km/h NorthwestClear
10pm44°F6°C12 mph19 km/h NorthwestClear
11pm42°F6°C11 mph18 km/h NorthwestClear
March 18
12am41°F5°C11 mph17 km/h NorthwestClear
1am39°F4°C10 mph16 km/h NorthwestClear
2am38°F3°C9 mph15 km/h NorthwestClear
3am37°F3°C9 mph14 km/h NorthwestClear
4am36°F2°C9 mph14 km/h NorthwestClear
DateLowHighWindDayNight
March 1741°F5°C58°F14°C11 mph18 km/h from NorthwestPartly CloudyClear
March 1836°F2°C64°F18°C5 mph8 km/h from NorthwestClearClear
March 1944°F7°C70°F21°C7 mph12 km/h from SoutheastPartly CloudyMostly Cloudy
March 2046°F8°C65°F18°C10 mph15 km/h from SouthRainRain
March 2137°F3°C54°F12°C15 mph23 km/h from NorthwestMostly ClearPartly Cloudy
March 2237°F3°C60°F16°C8 mph13 km/h from SouthwestMostly CloudyMostly Clear
March 2341°F5°C55°F13°C6 mph10 km/h from WestPartly CloudyMostly Cloudy

Yes

Low of 36°F2°C, High of 64°F18°C
Wind: 5 mph8 km/h
Precipitation: None

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