Yes

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

Why? Because it's cold enough to freeze the brass off a bald monkey
15°F-10°C & Windy

Wind is 17 mph28 km/h from the W, gusting to 34 mph54 km/h
February 29
11am15°F-9°C18 mph28 km/h WWindy
12pm16°F-9°C18 mph29 km/h WWindy
1pm17°F-9°C18 mph30 km/h WWindy
2pm17°F-8°C19 mph30 km/h WWindy
3pm18°F-8°C18 mph30 km/h WWindy
4pm17°F-8°C18 mph29 km/h WWindy
5pm16°F-9°C17 mph27 km/h WWindy
6pm16°F-9°C15 mph24 km/h WClear
7pm15°F-9°C13 mph22 km/h WClear
8pm14°F-10°C12 mph20 km/h NWClear
9pm13°F-11°C11 mph18 km/h NWClear
10pm12°F-11°C10 mph16 km/h WClear
DateLowHighWindDayNight
February 2910°F-12°C19°F-7°C16 mph27 km/h from WWindyMostly Clear
March 110°F-12°C34°F1°C6 mph10 km/h from SWPartly CloudyMostly Clear
March 228°F-2°C45°F7°C7 mph12 km/h from SMostly CloudyCloudy
March 335°F2°C51°F10°C4 mph7 km/h from NEMostly CloudyPartly Cloudy
March 435°F2°C53°F12°C6 mph10 km/h from NEMostly CloudyMostly Cloudy
March 541°F5°C56°F14°C7 mph12 km/h from SEPartly CloudyPartly Cloudy
March 638°F4°C51°F10°C6 mph9 km/h from SWDrizzleDrizzle

Yes

Low of 10°F-12°C, High of 35°F2°C
Wind: 6 mph10 km/h
Precipitation: None

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