Yes

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

Why? Because it's quite chilly!
44°F7°C & Cloudy

Wind is 6 mph9 km/h from the South, gusting to 12 mph19 km/h
October 25
1pm44°F7°C6 mph9 km/h SouthCloudy
2pm43°F6°C6 mph9 km/h SouthMostly Cloudy
3pm45°F7°C5 mph9 km/h SouthwestCloudy
4pm49°F9°C6 mph9 km/h SouthwestCloudy
5pm52°F11°C8 mph13 km/h SouthwestMostly Cloudy
6pm54°F12°C10 mph15 km/h SouthCloudy
7pm55°F13°C12 mph20 km/h SouthCloudy
8pm56°F13°C12 mph20 km/h SouthwestCloudy
9pm56°F14°C13 mph21 km/h SouthwestCloudy
10pm56°F13°C14 mph22 km/h SouthwestCloudy
11pm55°F13°C14 mph22 km/h SouthwestMostly Cloudy
October 26
12am53°F12°C14 mph22 km/h SouthwestCloudy
DateLowHighWindDayNight
October 2543°F6°C56°F14°C10 mph17 km/h from SouthwestCloudyPartly Cloudy
October 2633°F0°C46°F8°C14 mph23 km/h from SouthwestMostly ClearPartly Cloudy
October 2726°F-3°C37°F3°C14 mph23 km/h from WestPartly CloudyClear
October 2824°F-5°C39°F4°C6 mph10 km/h from WestMostly ClearPartly Cloudy
October 2931°F-1°C52°F11°C11 mph18 km/h from SouthwestPartly CloudyMostly Clear
October 3030°F-1°C47°F8°C7 mph10 km/h from WestMostly ClearMostly Clear
October 3132°F0°C50°F10°C14 mph22 km/h from WestMostly CloudyWindy

Yes

Low of 33°F1°C, High of 46°F8°C
Wind: 14 mph23 km/h
Precipitation: None

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