Yes

you do need a jacket based on the weather in St. Louis, MO, USA 1 second ago

Why? Because it's quite chilly.
43°F6°C & Cloudy

Wind is 1 mph2 km/h from the E, gusting to 3 mph5 km/h
December 2
1pm44°F7°C1 mph2 km/h ECloudy
2pm45°F7°C2 mph3 km/h SECloudy
3pm45°F7°C2 mph3 km/h SECloudy
4pm46°F8°C2 mph3 km/h SECloudy
5pm46°F8°C3 mph5 km/h ECloudy
6pm45°F7°C3 mph5 km/h SECloudy
7pm45°F7°C2 mph3 km/h SECloudy
8pm44°F7°C2 mph3 km/h ECloudy
9pm43°F6°C3 mph5 km/h EDrizzle
10pm43°F6°C4 mph7 km/h ERain
11pm42°F6°C5 mph9 km/h SERain
December 3
12am42°F6°C5 mph8 km/h SEDrizzle
DateLowHighWindDayNight
December 240°F5°C46°F8°C2 mph3 km/h from ECloudyRain
December 341°F5°C53°F12°C8 mph13 km/h from WMostly ClearRain
December 438°F3°C50°F10°C7 mph11 km/h from NWMostly ClearPartly Cloudy
December 537°F3°C47°F9°C13 mph22 km/h from NWPartly CloudyMostly Clear
December 632°F-0°C47°F9°C5 mph8 km/h from SMostly ClearMostly Clear
December 738°F3°C63°F17°C10 mph17 km/h from SMostly ClearPartly Cloudy
December 847°F9°C60°F16°C8 mph12 km/h from WMostly CloudyMostly Cloudy

Yes

Low of 41°F5°C, High of 54°F12°C
Wind: 8 mph13 km/h
Precipitation: None

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