Yes

you do need a jacket based on the weather in Montgomery, IL, 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 gusty, you’re basically doing accidental parkour!
43°F6°C & Clear

Wind is 10 mph16 km/h from the Southwest, gusting to 20 mph32 km/h
November 3
2am42°F6°C11 mph17 km/h SouthwestClear
3am41°F5°C11 mph18 km/h SouthwestClear
4am41°F5°C11 mph18 km/h SouthwestMostly Clear
5am40°F4°C11 mph18 km/h SouthwestClear
6am39°F4°C11 mph18 km/h SouthwestMostly Clear
7am40°F4°C12 mph19 km/h SouthwestMostly Cloudy
8am40°F5°C12 mph20 km/h SouthwestCloudy
9am41°F5°C12 mph19 km/h SouthwestCloudy
10am41°F5°C12 mph19 km/h SouthwestPartly Cloudy
11am40°F5°C11 mph18 km/h SouthwestPartly Cloudy
12pm40°F5°C11 mph17 km/h WestPartly Cloudy
1pm41°F5°C10 mph16 km/h WestMostly Clear
DateLowHighWindDayNight
November 236°F2°C53°F12°C5 mph8 km/h from SouthwestMostly ClearPartly Cloudy
November 339°F4°C58°F15°C10 mph17 km/h from WestClearPartly Cloudy
November 435°F2°C61°F16°C10 mph16 km/h from SouthPartly CloudyMostly Clear
November 540°F4°C61°F16°C12 mph19 km/h from NorthwestMostly ClearMostly Clear
November 635°F2°C58°F14°C9 mph15 km/h from SoutheastMostly CloudyRain
November 742°F5°C57°F14°C13 mph21 km/h from WestRainMostly Cloudy
November 837°F3°C49°F9°C6 mph10 km/h from NorthwestMostly CloudyDrizzle

Yes

Low of 39°F4°C, High of 58°F15°C
Wind: 10 mph17 km/h
Precipitation: None

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