Yes

you do need a jacket based on the weather in Greybull, WY 82426, USA 1 second ago

Why? Because it's pretty chilly.
53°F11°C & Cloudy

Wind is 14 mph23 km/h from the SE, gusting to 21 mph33 km/h
March 28
4pm54°F12°C15 mph24 km/h SECloudy
5pm56°F13°C13 mph21 km/h SECloudy
6pm58°F14°C13 mph21 km/h SCloudy
7pm55°F13°C13 mph20 km/h SWCloudy
8pm53°F12°C9 mph15 km/h WCloudy
9pm51°F10°C7 mph11 km/h SCloudy
10pm47°F9°C7 mph11 km/h NWCloudy
11pm44°F7°C9 mph15 km/h NWCloudy
March 29
12am42°F5°C10 mph16 km/h NWPartly Cloudy
1am40°F4°C11 mph17 km/h NWPartly Cloudy
2am38°F3°C10 mph15 km/h NWMostly Cloudy
3am37°F3°C7 mph12 km/h NWMostly Cloudy
DateLowHighWindDayNight
March 2830°F-1°C58°F14°C10 mph16 km/h from SCloudyMostly Cloudy
March 2930°F-1°C52°F11°C3 mph5 km/h from WPartly CloudyMostly Cloudy
March 3030°F-1°C47°F8°C7 mph11 km/h from NWCloudyMostly Cloudy
March 3130°F-1°C41°F5°C10 mph17 km/h from NWDrizzleFreezingdrizzle
April 130°F-1°C49°F10°C6 mph10 km/h from NWPartly CloudyMostly Clear
April 228°F-2°C59°F15°C5 mph8 km/h from SEClearClear
April 334°F1°C62°F17°C7 mph11 km/h from EPartly CloudyPartly Cloudy

Yes

Low of 30°F-1°C, High of 52°F11°C
Wind: 3 mph5 km/h
Precipitation: None

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