Yes

you do need a jacket based on the weather in Markham, ON L3S 3A6, Canada 1 second ago

Why? Because it's cold enough to freeze the brass off a bald monkey
30°F-1°C & Clear

Wind is 7 mph11 km/h from the NW, gusting to 16 mph25 km/h
March 29
8am30°F-1°C7 mph11 km/h NWClear
9am33°F0°C8 mph13 km/h NWMostly Clear
10am35°F2°C9 mph14 km/h NWPartly Cloudy
11am37°F3°C10 mph16 km/h NWMostly Cloudy
12pm40°F4°C11 mph17 km/h NWMostly Cloudy
1pm41°F5°C12 mph19 km/h NWCloudy
2pm42°F6°C12 mph19 km/h NWCloudy
3pm43°F6°C12 mph20 km/h NWCloudy
4pm44°F6°C13 mph21 km/h NWMostly Cloudy
5pm42°F6°C13 mph20 km/h NWMostly Cloudy
6pm41°F5°C12 mph20 km/h NWMostly Cloudy
7pm39°F4°C11 mph18 km/h NWMostly Cloudy
DateLowHighWindDayNight
March 2929°F-2°C44°F6°C11 mph17 km/h from NWMostly CloudyMostly Clear
March 3029°F-2°C46°F8°C4 mph6 km/h from SWMostly CloudyCloudy
March 3132°F0°C48°F9°C7 mph11 km/h from NWMostly CloudyMostly Cloudy
April 134°F1°C50°F10°C7 mph11 km/h from EMostly CloudyCloudy
April 239°F4°C44°F7°C15 mph24 km/h from EDrizzleRain
April 335°F2°C40°F4°C15 mph24 km/h from ERainDrizzle
April 433°F0°C42°F5°C14 mph22 km/h from NWCloudyPartly Cloudy

Yes

Low of 29°F-2°C, High of 46°F8°C
Wind: 4 mph6 km/h
Precipitation: None

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