Yes

you do need a jacket based on the weather in Hamilton, ON, Canada 23 minutes ago

Why? Because it's quite chilly and there are strong winds blowing out there!
39°F4°C & Windy

Wind is 15 mph24 km/h from the Southwest, gusting to 26 mph42 km/h
February 24
10pm38°F4°C14 mph22 km/h SouthwestMostly Cloudy
11pm38°F3°C12 mph20 km/h SouthwestCloudy
February 25
12am38°F3°C10 mph16 km/h SouthwestCloudy
1am37°F3°C8 mph13 km/h SouthwestCloudy
2am37°F3°C8 mph13 km/h SouthwestCloudy
3am36°F2°C8 mph13 km/h SouthwestCloudy
4am36°F2°C8 mph13 km/h SouthwestCloudy
5am36°F2°C8 mph12 km/h SouthwestCloudy
6am35°F2°C7 mph11 km/h SouthwestCloudy
7am35°F2°C7 mph11 km/h SouthwestCloudy
8am35°F2°C7 mph11 km/h SouthwestCloudy
9am36°F2°C7 mph12 km/h SouthwestCloudy
DateLowHighWindDayNight
February 2430°F-1°C47°F8°C15 mph25 km/h from SouthwestWindyMostly Cloudy
February 2534°F1°C42°F6°C8 mph13 km/h from SouthwestMostly CloudyPartly Cloudy
February 2628°F-2°C37°F3°C5 mph8 km/h from SouthwestDrizzleDrizzle
February 2733°F1°C38°F3°C10 mph17 km/h from WestCloudyMostly Cloudy
February 2820°F-6°C33°F1°C7 mph11 km/h from SouthwestMostly CloudySnow
March 117°F-8°C35°F2°C16 mph25 km/h from WestWindyPartly Cloudy
March 29°F-13°C22°F-6°C7 mph12 km/h from NorthwestMostly ClearMostly Clear

Yes

Low of 34°F1°C, High of 42°F6°C
Wind: 8 mph13 km/h
Precipitation: None

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