Yes

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

Why? Because the wind makes walking forward feel like moonwalking in reverse!
87°F30°C & Mostly Cloudy

Wind is 14 mph23 km/h from the West, gusting to 29 mph47 km/h
July 17
4pm86°F30°C14 mph22 km/h WestMostly Clear
5pm84°F29°C13 mph22 km/h WestPartly Cloudy
6pm82°F28°C12 mph19 km/h WestPartly Cloudy
7pm80°F27°C10 mph16 km/h WestPartly Cloudy
8pm78°F25°C8 mph12 km/h WestMostly Clear
9pm75°F24°C6 mph10 km/h WestMostly Clear
10pm74°F23°C6 mph9 km/h NorthwestPartly Cloudy
11pm72°F22°C6 mph9 km/h NorthwestPartly Cloudy
July 18
12am70°F21°C5 mph8 km/h NorthwestPartly Cloudy
1am69°F21°C5 mph8 km/h NorthwestPartly Cloudy
2am68°F20°C5 mph8 km/h NorthwestPartly Cloudy
3am66°F19°C4 mph7 km/h NorthwestMostly Clear
DateLowHighWindDayNight
July 1770°F21°C87°F30°C9 mph15 km/h from WestPartly CloudyPartly Cloudy
July 1864°F18°C80°F27°C4 mph6 km/h from NorthwestPartly CloudyMostly Cloudy
July 1964°F18°C82°F28°C4 mph6 km/h from SouthDrizzleRain
July 2067°F19°C82°F28°C6 mph10 km/h from NorthwestDrizzleMostly Clear
July 2161°F16°C78°F26°C7 mph11 km/h from NorthMostly ClearClear
July 2254°F12°C78°F26°C3 mph5 km/h from SoutheastMostly ClearPartly Cloudy
July 2362°F17°C80°F27°C5 mph8 km/h from SouthMostly CloudyPartly Cloudy

No

Low of 64°F18°C, High of 80°F27°C
Wind: 4 mph6 km/h
Precipitation: None

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