Yes

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

Why? Because it's cold. simple as that.
42°F5°C & Mostly Clear

Wind is 12 mph19 km/h from the W, gusting to 24 mph38 km/h
April 20
5am40°F5°C12 mph19 km/h WMostly Clear
6am38°F3°C11 mph18 km/h WMostly Clear
7am37°F3°C12 mph20 km/h WMostly Clear
8am38°F3°C15 mph23 km/h WMostly Clear
9am39°F4°C17 mph28 km/h WWindy
10am40°F4°C18 mph28 km/h WWindy
11am42°F5°C17 mph28 km/h WWindy
12pm44°F6°C17 mph27 km/h WWindy
1pm45°F7°C16 mph26 km/h WWindy
2pm47°F8°C16 mph25 km/h WWindy
3pm48°F9°C15 mph24 km/h WWindy
4pm48°F9°C15 mph24 km/h WCloudy
DateLowHighWindDayNight
April 2037°F3°C49°F9°C16 mph25 km/h from WWindyPartly Cloudy
April 2134°F1°C55°F13°C12 mph20 km/h from WPartly CloudyMostly Clear
April 2236°F2°C57°F14°C9 mph14 km/h from SMostly ClearMostly Cloudy
April 2346°F8°C60°F16°C19 mph30 km/h from SWDrizzleDrizzle
April 2437°F3°C51°F11°C16 mph25 km/h from NWindyClear
April 2534°F1°C52°F11°C9 mph14 km/h from NEMostly ClearMostly Clear
April 2640°F5°C62°F17°C10 mph16 km/h from SEPartly CloudyCloudy

Yes

Low of 34°F1°C, High of 55°F13°C
Wind: 12 mph20 km/h
Precipitation: None

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