Yes

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

Why? Because your nose hairs will turn into tiny icicles and it's so windy, even the squirrels are holding onto branches for dear life!
23°F-5°C & Cloudy

Wind is 9 mph14 km/h from the West, gusting to 19 mph31 km/h
January 16
6pm23°F-5°C9 mph15 km/h WestCloudy
7pm23°F-5°C10 mph16 km/h WestCloudy
8pm24°F-4°C9 mph14 km/h WestCloudy
9pm25°F-4°C9 mph14 km/h WestMostly Cloudy
10pm25°F-4°C9 mph15 km/h WestMostly Cloudy
11pm25°F-4°C9 mph15 km/h WestCloudy
January 17
12am25°F-4°C9 mph14 km/h WestMostly Cloudy
1am27°F-3°C11 mph17 km/h WestMostly Cloudy
2am26°F-3°C10 mph17 km/h WestMostly Cloudy
3am24°F-4°C10 mph16 km/h WestPartly Cloudy
4am22°F-5°C9 mph15 km/h WestPartly Cloudy
5am21°F-6°C8 mph13 km/h WestPartly Cloudy
DateLowHighWindDayNight
January 1617°F-8°C25°F-4°C10 mph16 km/h from WestSnowMostly Cloudy
January 1719°F-7°C33°F1°C13 mph21 km/h from SouthMostly CloudySnow
January 1817°F-8°C33°F1°C15 mph24 km/h from WestSnowMostly Cloudy
January 197°F-14°C18°F-8°C8 mph14 km/h from NorthwestCloudyPartly Cloudy
January 20-2°F-19°C8°F-13°C15 mph24 km/h from WestWindyPartly Cloudy
January 21-3°F-20°C7°F-14°C12 mph20 km/h from WestPartly CloudyMostly Clear
January 22-5°F-21°C11°F-12°C11 mph18 km/h from SouthwestMostly ClearMostly Cloudy

Yes

Low of 19°F-8°C, High of 33°F1°C
Wind: 13 mph21 km/h
Precipitation: None

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