Yes

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

Why? Because it's quite chilly!
42°F6°C & Cloudy

Wind is 3 mph5 km/h from the Southeast, gusting to 6 mph9 km/h
November 4
8am43°F6°C4 mph7 km/h SoutheastCloudy
9am45°F7°C5 mph8 km/h SoutheastCloudy
10am45°F7°C4 mph7 km/h EastCloudy
11am46°F8°C0 mph0 km/h SouthwestCloudy
12pm44°F7°C2 mph4 km/h WestCloudy
1pm42°F6°C7 mph12 km/h WestCloudy
2pm41°F5°C4 mph6 km/h WestDrizzle
3pm43°F6°C3 mph5 km/h WestCloudy
4pm43°F6°C4 mph7 km/h WestCloudy
5pm46°F8°C5 mph8 km/h WestCloudy
6pm48°F9°C7 mph11 km/h WestCloudy
7pm48°F9°C6 mph9 km/h NorthwestCloudy
DateLowHighWindDayNight
November 439°F4°C50°F10°C4 mph6 km/h from NorthwestDrizzleMostly Cloudy
November 538°F4°C60°F16°C5 mph9 km/h from SouthCloudyMostly Cloudy
November 637°F3°C48°F9°C12 mph19 km/h from WestPartly CloudyPartly Cloudy
November 732°F-0°C47°F8°C9 mph14 km/h from WestRainPartly Cloudy
November 829°F-2°C41°F5°C4 mph7 km/h from WestPartly CloudyPartly Cloudy
November 928°F-2°C46°F8°C2 mph3 km/h from SouthMostly CloudyMostly Cloudy
November 1037°F3°C56°F13°C3 mph5 km/h from SouthMostly CloudyMostly Cloudy

Yes

Low of 38°F4°C, High of 61°F16°C
Wind: 5 mph9 km/h
Precipitation: None

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