Yes

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

Why? Because it's bitterly cold.
44°F7°C & Clear

Wind is 4 mph7 km/h from the SE, gusting to 11 mph18 km/h
April 26
2am42°F6°C2 mph3 km/h EMostly Clear
3am41°F5°C3 mph5 km/h EMostly Clear
4am39°F4°C3 mph5 km/h NEMostly Clear
5am39°F4°C3 mph5 km/h EMostly Clear
6am38°F3°C3 mph5 km/h EMostly Clear
7am39°F4°C3 mph5 km/h EClear
8am43°F6°C3 mph4 km/h EClear
9am48°F9°C4 mph6 km/h EClear
10am52°F11°C5 mph7 km/h SEClear
11am56°F13°C6 mph9 km/h SEClear
12pm59°F15°C7 mph11 km/h SEClear
1pm61°F16°C7 mph11 km/h SEClear
DateLowHighWindDayNight
April 2638°F3°C65°F18°C6 mph9 km/h from SEClearMostly Cloudy
April 2739°F4°C59°F15°C8 mph14 km/h from SECloudyMostly Cloudy
April 2847°F8°C81°F27°C4 mph7 km/h from SWPartly CloudyPartly Cloudy
April 2956°F14°C86°F30°C3 mph5 km/h from WPartly CloudyPartly Cloudy
April 3058°F15°C80°F27°C7 mph11 km/h from SDrizzleDrizzle
May 158°F15°C80°F27°C4 mph7 km/h from WMostly ClearPartly Cloudy
May 255°F13°C78°F25°C5 mph9 km/h from SWPartly CloudyPartly Cloudy

Yes

Low of 39°F4°C, High of 59°F15°C
Wind: 8 mph14 km/h
Precipitation: 26% rain

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