Yes

you do need a jacket based on the weather in Lewes, DE 19958, USA 1 second ago

Why? Because snow is coming down so hard, you can barely see two feet in front of you and Jack Frost is nipping at your nose!
26°F-3°C & Heavy Snow

Wind is 2 mph4 km/h from the West, gusting to 5 mph8 km/h
January 6
6am26°F-3°C1 mph2 km/h NortheastHeavy Snow
7am27°F-3°C3 mph5 km/h EastHeavy Snow
8am28°F-2°C5 mph8 km/h EastHeavy Snow
9am29°F-2°C6 mph10 km/h NortheastHeavy Snow
10am31°F-1°C8 mph13 km/h NortheastHeavy Snow
11am32°F-0°C10 mph16 km/h NortheastHeavy Snow
12pm33°F1°C11 mph18 km/h NortheastSnow
1pm34°F1°C12 mph20 km/h NortheastSnow
2pm34°F1°C14 mph23 km/h NortheastSnow
3pm34°F1°C15 mph24 km/h NortheastSnow
4pm34°F1°C16 mph25 km/h NortheastSnow
5pm34°F1°C16 mph26 km/h NortheastWindy
DateLowHighWindDayNight
January 626°F-3°C34°F1°C12 mph19 km/h from NortheastHeavy SnowSnow
January 721°F-6°C32°F0°C23 mph36 km/h from NorthwestWindyWindy
January 823°F-5°C30°F-1°C19 mph31 km/h from WestWindyWindy
January 920°F-7°C30°F-1°C23 mph37 km/h from NorthwestWindyWindy
January 1023°F-5°C33°F0°C16 mph25 km/h from NorthwestWindyCloudy
January 1127°F-3°C33°F1°C10 mph15 km/h from NorthHeavy SnowHeavy Snow
January 1225°F-4°C35°F2°C15 mph24 km/h from NorthwestMostly ClearClear

Yes

Low of 21°F-6°C, High of 32°F0°C
Wind: 23 mph36 km/h
Precipitation: None

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