Yes

you do need a jacket based on the weather in Halifax, MA 02338, USA 1 second ago

Why? Because it's cold. simple as that.
40°F5°C & Clear

Wind is 6 mph9 km/h from the S, gusting to 14 mph22 km/h
April 25
10pm39°F4°C5 mph9 km/h SWClear
11pm37°F3°C5 mph8 km/h SWClear
April 26
12am36°F2°C4 mph7 km/h SWClear
1am34°F1°C4 mph6 km/h SWClear
2am34°F1°C3 mph5 km/h SWClear
3am33°F0°C3 mph6 km/h WClear
4am32°F-0°C3 mph5 km/h WClear
5am31°F-1°C3 mph5 km/h WClear
6am31°F-0°C3 mph5 km/h NWClear
7am35°F1°C3 mph5 km/h NWClear
8am40°F5°C3 mph5 km/h NClear
9am45°F7°C5 mph7 km/h NClear
DateLowHighWindDayNight
April 2532°F0°C54°F12°C4 mph6 km/h from NEClearClear
April 2631°F-1°C56°F13°C6 mph10 km/h from NEClearClear
April 2733°F0°C63°F17°C5 mph8 km/h from SWMostly ClearCloudy
April 2841°F5°C62°F17°C9 mph14 km/h from SWMostly CloudyPartly Cloudy
April 2950°F10°C64°F18°C7 mph11 km/h from NEMostly CloudyMostly Cloudy
April 3047°F8°C60°F15°C7 mph11 km/h from SECloudyRain
May 146°F8°C60°F15°C7 mph12 km/h from NEMostly CloudyCloudy

Yes

Low of 31°F-1°C, High of 55°F13°C
Wind: 6 mph10 km/h
Precipitation: None

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