Yes

you do need a jacket based on the weather in Vaughan, ON, Canada 1 second ago

Why? Because it's FREEZING out there and the wind could blow a wig clean off your head!
19°F-7°C & Clear

Wind is 9 mph14 km/h from the West, gusting to 19 mph31 km/h
December 13
11am21°F-6°C9 mph15 km/h WestClear
12pm23°F-5°C9 mph15 km/h WestClear
1pm24°F-4°C9 mph14 km/h WestMostly Clear
2pm25°F-4°C8 mph13 km/h WestMostly Clear
3pm25°F-4°C7 mph12 km/h WestMostly Clear
4pm24°F-4°C7 mph10 km/h WestClear
5pm22°F-5°C6 mph9 km/h WestClear
6pm21°F-6°C5 mph8 km/h WestClear
7pm19°F-7°C5 mph8 km/h WestClear
8pm18°F-8°C4 mph6 km/h WestClear
9pm17°F-9°C3 mph5 km/h WestClear
10pm16°F-9°C3 mph5 km/h WestClear
DateLowHighWindDayNight
December 1314°F-10°C25°F-4°C7 mph12 km/h from WestClearClear
December 1413°F-10°C31°F-1°C7 mph11 km/h from EastPartly CloudyCloudy
December 1525°F-4°C36°F2°C8 mph12 km/h from SoutheastSnowCloudy
December 1634°F1°C44°F7°C8 mph12 km/h from SoutheastDrizzleRain
December 1733°F0°C45°F7°C12 mph19 km/h from WestMostly CloudyCloudy
December 1830°F-1°C38°F3°C6 mph9 km/h from WestCloudyMostly Cloudy
December 1922°F-6°C34°F1°C7 mph11 km/h from NorthMostly CloudyPartly Cloudy

Yes

Low of 13°F-11°C, High of 31°F-1°C
Wind: 7 mph11 km/h
Precipitation: None

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