Yes

you do need a jacket based on the weather in Montreal, QC, Canada 1 second ago

Why? Because it's quite chilly.
37°F3°C & Cloudy

Wind is 7 mph11 km/h from the NE, gusting to 14 mph22 km/h
December 2
3pm37°F3°C7 mph11 km/h NECloudy
4pm36°F2°C6 mph10 km/h NECloudy
5pm36°F2°C6 mph10 km/h NECloudy
6pm35°F2°C6 mph10 km/h NECloudy
7pm35°F2°C6 mph10 km/h NECloudy
8pm34°F1°C8 mph12 km/h NECloudy
9pm33°F1°C8 mph13 km/h NECloudy
10pm32°F0°C8 mph13 km/h NECloudy
11pm32°F-0°C8 mph12 km/h NECloudy
December 3
12am31°F-0°C7 mph12 km/h NECloudy
1am31°F-1°C8 mph12 km/h NECloudy
2am30°F-1°C8 mph13 km/h NECloudy
DateLowHighWindDayNight
December 231°F-0°C39°F4°C7 mph11 km/h from NEDrizzleCloudy
December 329°F-2°C35°F2°C11 mph17 km/h from NERainHeavysnow
December 427°F-3°C33°F0°C9 mph14 km/h from NSnowCloudy
December 520°F-7°C27°F-3°C4 mph7 km/h from NECloudyCloudy
December 614°F-10°C21°F-6°C4 mph7 km/h from NMostly CloudyMostly Cloudy
December 713°F-11°C24°F-5°C5 mph7 km/h from WPartly CloudyPartly Cloudy
December 817°F-8°C28°F-2°C6 mph10 km/h from NESnowSnow

Yes

Low of 28°F-2°C, High of 35°F2°C
Wind: 11 mph17 km/h
Precipitation: 80% rain

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