Yes

you do need a jacket based on the weather in Mission Field Airport, Montana 59047, USA 1 second ago

Why? Because you're not freezing, but you’ll definitely start complaining if it lasts much longer and it's so windy, your hat has officially retired from your head!
40°F4°C & Clear

Wind is 12 mph19 km/h from the West, gusting to 21 mph34 km/h
October 21
3am39°F4°C13 mph20 km/h WestClear
4am38°F3°C11 mph18 km/h WestClear
5am37°F3°C10 mph15 km/h WestClear
6am36°F2°C9 mph15 km/h WestClear
7am36°F2°C9 mph15 km/h WestClear
8am35°F2°C9 mph14 km/h WestMostly Clear
9am35°F2°C8 mph14 km/h WestMostly Clear
10am35°F2°C9 mph14 km/h WestPartly Cloudy
11am36°F2°C8 mph14 km/h WestPartly Cloudy
12pm36°F2°C11 mph17 km/h SouthwestPartly Cloudy
1pm37°F3°C11 mph17 km/h SouthwestClear
2pm37°F3°C11 mph17 km/h SouthwestClear
DateLowHighWindDayNight
October 2036°F2°C50°F10°C21 mph33 km/h from WestWindyMostly Clear
October 2135°F2°C57°F14°C11 mph17 km/h from WestMostly ClearClear
October 2234°F1°C60°F15°C4 mph6 km/h from WestClearPartly Cloudy
October 2337°F3°C59°F15°C5 mph9 km/h from WestMostly ClearPartly Cloudy
October 2438°F3°C61°F16°C6 mph10 km/h from SouthwestPartly CloudyPartly Cloudy
October 2539°F4°C54°F12°C9 mph15 km/h from WestMostly CloudyPartly Cloudy
October 2633°F1°C47°F8°C7 mph11 km/h from SouthwestRainPartly Cloudy

Yes

Low of 36°F2°C, High of 57°F14°C
Wind: 11 mph17 km/h
Precipitation: None

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