Yes

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

Why? Because it's cold enough that makes you wish you had a hat, but you're still too proud to admit it and it's so windy, your hat is now someone else's problem, two cities away!
48°F9°C & Cloudy

Wind is 14 mph23 km/h from the Southwest, gusting to 27 mph44 km/h
March 20
5pm48°F9°C15 mph24 km/h SouthwestDrizzle
6pm46°F8°C14 mph23 km/h WestCloudy
7pm39°F4°C17 mph28 km/h NorthwestWindy
8pm36°F2°C18 mph29 km/h NorthwestWindy
9pm34°F1°C19 mph31 km/h NorthwestWindy
10pm32°F0°C21 mph33 km/h NorthwestWindy
11pm32°F-0°C22 mph35 km/h NorthwestWindy
March 21
12am31°F-1°C20 mph31 km/h NorthwestWindy
1am30°F-1°C17 mph28 km/h NorthwestWindy
2am29°F-2°C15 mph24 km/h NorthwestMostly Clear
3am28°F-2°C13 mph20 km/h NorthwestMostly Clear
4am28°F-2°C11 mph18 km/h NorthwestMostly Clear
DateLowHighWindDayNight
March 2031°F-1°C48°F9°C11 mph18 km/h from SouthwestRainWindy
March 2127°F-3°C44°F7°C10 mph17 km/h from SouthwestClearMostly Cloudy
March 2224°F-5°C41°F5°C17 mph28 km/h from NorthwestWindyMostly Clear
March 2323°F-5°C35°F2°C7 mph11 km/h from SoutheastPartly CloudyRain
March 2432°F0°C43°F6°C14 mph22 km/h from SouthwestDrizzleCloudy
March 2531°F-1°C38°F3°C11 mph18 km/h from WestCloudyMostly Cloudy
March 2628°F-2°C38°F3°C9 mph14 km/h from NorthwestMostly CloudyPartly Cloudy

Yes

Low of 27°F-3°C, High of 45°F7°C
Wind: 10 mph17 km/h
Precipitation: None

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