Yes

you do need a jacket based on the weather in Markham (Buttonville), Ontario, Canada 1 second ago

Why? Because it's FREEZING out there and it's so windy, your hat has officially retired from your head!
17°F-8°C & Mostly Clear

Wind is 12 mph19 km/h from the North, gusting to 24 mph39 km/h
January 6
4pm17°F-8°C12 mph19 km/h NorthMostly Clear
5pm17°F-9°C11 mph18 km/h NorthMostly Clear
6pm16°F-9°C11 mph18 km/h NorthMostly Clear
7pm15°F-10°C12 mph19 km/h NorthMostly Clear
8pm14°F-10°C12 mph19 km/h NorthMostly Clear
9pm14°F-10°C12 mph19 km/h NorthMostly Clear
10pm13°F-10°C12 mph19 km/h NorthwestMostly Clear
11pm14°F-10°C12 mph19 km/h NorthwestMostly Clear
January 7
12am14°F-10°C12 mph19 km/h NorthwestMostly Clear
1am14°F-10°C12 mph19 km/h NorthwestPartly Cloudy
2am14°F-10°C12 mph20 km/h NorthwestPartly Cloudy
3am14°F-10°C13 mph20 km/h NorthwestPartly Cloudy
DateLowHighWindDayNight
January 613°F-10°C24°F-4°C8 mph13 km/h from NorthPartly CloudyMostly Clear
January 712°F-11°C23°F-5°C12 mph20 km/h from NorthwestMostly CloudyPartly Cloudy
January 86°F-14°C17°F-9°C10 mph16 km/h from NorthwestPartly CloudyPartly Cloudy
January 99°F-13°C23°F-5°C15 mph24 km/h from NorthwestPartly CloudyMostly Clear
January 1013°F-10°C26°F-3°C4 mph7 km/h from WestMostly CloudyCloudy
January 1119°F-7°C29°F-2°C6 mph9 km/h from NorthwestMostly CloudyPartly Cloudy
January 1218°F-8°C30°F-1°C7 mph11 km/h from WestMostly CloudyMostly Cloudy

Yes

Low of 12°F-11°C, High of 23°F-5°C
Wind: 12 mph20 km/h
Precipitation: None

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