Yes

you do need a jacket based on the weather in New Haven, CT, USA 1 second ago

Why? Because too cold for just a hoodie, too warm for a parka!
39°F4°C & Mostly Clear

Wind is 6 mph9 km/h from the West, gusting to 13 mph21 km/h
November 5
10am39°F4°C5 mph8 km/h WestMostly Clear
11am39°F4°C4 mph7 km/h WestPartly Cloudy
12pm40°F4°C3 mph5 km/h WestMostly Clear
1pm43°F6°C2 mph4 km/h SouthwestMostly Cloudy
2pm48°F9°C3 mph5 km/h SouthwestCloudy
3pm50°F10°C4 mph6 km/h SouthwestCloudy
4pm53°F12°C6 mph9 km/h SouthCloudy
5pm55°F13°C9 mph15 km/h SouthMostly Cloudy
6pm58°F14°C12 mph19 km/h SouthCloudy
7pm59°F15°C13 mph21 km/h SouthCloudy
8pm59°F15°C13 mph21 km/h SouthCloudy
9pm58°F15°C13 mph20 km/h SouthCloudy
DateLowHighWindDayNight
November 537°F3°C59°F15°C9 mph15 km/h from SouthwestMostly CloudyWindy
November 636°F2°C52°F11°C13 mph20 km/h from NorthwestMostly ClearMostly Clear
November 734°F1°C56°F13°C11 mph18 km/h from SouthMostly CloudyRain
November 849°F9°C63°F17°C6 mph10 km/h from WestRainPartly Cloudy
November 946°F8°C59°F15°C8 mph13 km/h from SoutheastRainRain
November 1035°F1°C49°F9°C9 mph14 km/h from NorthwestPartly CloudyPartly Cloudy
November 1133°F0°C41°F5°C14 mph23 km/h from WestMostly CloudyPartly Cloudy

Yes

Low of 37°F3°C, High of 53°F12°C
Wind: 13 mph20 km/h
Precipitation: None

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