Yes

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

Why? Because it's colder than a polar bear's pyjamas!
29°F-1°C & Partly Cloudy

Wind is 6 mph10 km/h from the Southwest, gusting to 17 mph27 km/h
January 26
3am29°F-2°C6 mph10 km/h SouthwestPartly Cloudy
4am30°F-1°C6 mph10 km/h SouthwestPartly Cloudy
5am30°F-1°C6 mph10 km/h SouthwestCloudy
6am30°F-1°C6 mph9 km/h SouthwestMostly Cloudy
7am30°F-1°C6 mph9 km/h SouthwestCloudy
8am31°F-0°C5 mph8 km/h SouthwestCloudy
9am34°F1°C5 mph8 km/h SouthwestCloudy
10am37°F3°C5 mph7 km/h WestCloudy
11am39°F4°C5 mph7 km/h WestCloudy
12pm41°F5°C5 mph8 km/h WestCloudy
1pm42°F5°C5 mph8 km/h WestCloudy
2pm42°F6°C5 mph9 km/h WestCloudy
DateLowHighWindDayNight
January 2628°F-2°C43°F6°C4 mph7 km/h from WestMostly CloudyPartly Cloudy
January 2726°F-3°C46°F8°C4 mph7 km/h from SouthwestClearMostly Clear
January 2830°F-1°C46°F8°C7 mph11 km/h from WestMostly ClearMostly Clear
January 2930°F-1°C54°F12°C10 mph15 km/h from WestMostly ClearMostly Clear
January 3027°F-3°C43°F6°C8 mph12 km/h from NorthwestMostly ClearPartly Cloudy
January 3126°F-3°C40°F5°C6 mph10 km/h from NorthwestPartly CloudyMostly Cloudy
February 129°F-2°C48°F9°C6 mph10 km/h from SouthwestMostly CloudyMostly Cloudy

Yes

Low of 27°F-3°C, High of 46°F8°C
Wind: 4 mph7 km/h
Precipitation: None

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