Yes

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

Why? Because it's bitterly cold.
43°F6°C & Clear

Wind is 4 mph7 km/h from the S, gusting to 11 mph18 km/h
April 27
12am43°F6°C4 mph7 km/h SClear
1am41°F5°C4 mph6 km/h SClear
2am40°F4°C3 mph5 km/h SWClear
3am38°F4°C3 mph4 km/h SWClear
4am38°F3°C2 mph4 km/h SWClear
5am37°F3°C2 mph4 km/h SWMostly Clear
6am37°F3°C2 mph3 km/h SWMostly Clear
7am39°F4°C2 mph3 km/h SWClear
8am44°F7°C3 mph4 km/h SWMostly Clear
9am48°F9°C4 mph7 km/h SWPartly Cloudy
10am52°F11°C6 mph9 km/h SMostly Cloudy
11am56°F13°C7 mph11 km/h SPartly Cloudy
DateLowHighWindDayNight
April 2633°F0°C60°F15°C4 mph7 km/h from SEClearClear
April 2737°F3°C61°F16°C8 mph13 km/h from SMostly CloudyDrizzle
April 2844°F7°C68°F20°C7 mph11 km/h from SWDrizzleMostly Cloudy
April 2954°F12°C79°F26°C6 mph9 km/h from NPartly CloudyPartly Cloudy
April 3049°F9°C64°F18°C8 mph12 km/h from SEMostly CloudyRain
May 147°F8°C61°F16°C6 mph10 km/h from EMostly CloudyPartly Cloudy
May 246°F8°C71°F22°C6 mph10 km/h from SPartly CloudyMostly Cloudy

Yes

Low of 37°F3°C, High of 61°F16°C
Wind: 8 mph13 km/h
Precipitation: None

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