Yes

you do need a jacket based on the weather in Ottawa (Orléans), Ontario, Canada 1 second ago

Why? Because it's FREEZING out there!
14°F-10°C & Mostly Clear

Wind is 7 mph12 km/h from the Northwest, gusting to 17 mph27 km/h
January 5
3pm15°F-10°C8 mph12 km/h NorthwestMostly Cloudy
4pm15°F-10°C7 mph11 km/h NorthwestMostly Cloudy
5pm14°F-10°C5 mph9 km/h WestPartly Cloudy
6pm13°F-11°C5 mph7 km/h WestMostly Clear
7pm12°F-11°C4 mph7 km/h WestMostly Clear
8pm11°F-12°C4 mph6 km/h WestMostly Clear
9pm10°F-12°C4 mph6 km/h WestPartly Cloudy
10pm10°F-12°C4 mph6 km/h NorthwestPartly Cloudy
11pm9°F-13°C3 mph6 km/h NorthwestMostly Clear
January 6
12am8°F-13°C4 mph6 km/h NorthwestMostly Clear
1am8°F-13°C4 mph6 km/h NorthwestMostly Clear
2am7°F-14°C4 mph6 km/h NorthwestMostly Clear
DateLowHighWindDayNight
January 58°F-13°C15°F-9°C7 mph12 km/h from NorthwestMostly CloudyMostly Clear
January 65°F-15°C19°F-7°C7 mph11 km/h from NorthwestMostly ClearMostly Cloudy
January 79°F-13°C20°F-7°C14 mph23 km/h from NorthwestMostly CloudyMostly Cloudy
January 86°F-15°C12°F-11°C13 mph21 km/h from WestCloudyCloudy
January 910°F-12°C21°F-6°C12 mph20 km/h from NorthwestMostly CloudyMostly Clear
January 109°F-13°C24°F-4°C5 mph8 km/h from WestMostly ClearMostly Cloudy
January 1116°F-9°C26°F-3°C6 mph10 km/h from NortheastSnowMostly Cloudy

Yes

Low of 5°F-15°C, High of 19°F-7°C
Wind: 7 mph11 km/h
Precipitation: None

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