Yes

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

Why? Because it's cold. simple as that.
39°F4°C & Cloudy

Wind is 6 mph9 km/h from the SE, gusting to 10 mph16 km/h
December 2
2pm39°F4°C6 mph10 km/h SECloudy
3pm39°F4°C7 mph11 km/h SECloudy
4pm39°F4°C7 mph11 km/h SECloudy
5pm38°F3°C6 mph9 km/h SECloudy
6pm37°F3°C5 mph8 km/h SECloudy
7pm36°F2°C4 mph7 km/h SECloudy
8pm36°F2°C5 mph8 km/h SECloudy
9pm35°F2°C5 mph8 km/h SECloudy
10pm34°F1°C5 mph8 km/h SECloudy
11pm34°F1°C4 mph7 km/h SECloudy
December 3
12am33°F1°C4 mph6 km/h SECloudy
1am33°F0°C3 mph5 km/h SEFlurries
DateLowHighWindDayNight
December 229°F-2°C39°F4°C5 mph8 km/h from SECloudySnow
December 327°F-3°C41°F5°C4 mph6 km/h from NWMostly CloudyPartly Cloudy
December 425°F-4°C41°F5°C9 mph14 km/h from SMostly CloudyPartly Cloudy
December 526°F-3°C39°F4°C14 mph22 km/h from NWMostly CloudyPartly Cloudy
December 625°F-4°C43°F6°C10 mph17 km/h from SMostly CloudyPartly Cloudy
December 734°F1°C55°F13°C9 mph14 km/h from SWPartly CloudyPartly Cloudy
December 833°F1°C46°F8°C10 mph17 km/h from NWPartly CloudyMostly Cloudy

Yes

Low of 28°F-3°C, High of 41°F5°C
Wind: 4 mph6 km/h
Precipitation: None

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