Yes

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

Why? Because it's cold enough to freeze the brass off a bald monkey
31°F-0°C & Mostly Clear

Wind is 4 mph6 km/h from the W, gusting to 10 mph16 km/h
March 28
6am31°F-0°C4 mph6 km/h WMostly Clear
7am30°F-1°C4 mph6 km/h SWMostly Clear
8am30°F-1°C4 mph7 km/h SWMostly Clear
9am33°F0°C5 mph8 km/h SWMostly Clear
10am36°F2°C6 mph10 km/h SWMostly Clear
11am39°F4°C7 mph12 km/h SWMostly Clear
12pm43°F6°C8 mph13 km/h SWMostly Clear
1pm45°F7°C9 mph15 km/h SWMostly Clear
2pm47°F8°C10 mph16 km/h SWMostly Clear
3pm48°F9°C10 mph16 km/h SWMostly Clear
4pm49°F10°C10 mph17 km/h WMostly Clear
5pm48°F9°C11 mph17 km/h WMostly Clear
DateLowHighWindDayNight
March 2830°F-1°C49°F10°C8 mph13 km/h from SWMostly ClearMostly Clear
March 2929°F-2°C44°F7°C10 mph16 km/h from NWMostly CloudyMostly Clear
March 3028°F-2°C47°F8°C3 mph5 km/h from SWMostly CloudyCloudy
March 3132°F0°C47°F9°C7 mph11 km/h from NWMostly CloudyCloudy
April 132°F-0°C49°F10°C9 mph14 km/h from EMostly CloudyCloudy
April 238°F3°C46°F8°C12 mph19 km/h from NERainRain
April 335°F2°C44°F7°C12 mph20 km/h from NWDrizzlePartly Cloudy

Yes

Low of 28°F-2°C, High of 44°F7°C
Wind: 10 mph16 km/h
Precipitation: None

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