Yes

you do need a jacket based on the weather in Los Alamos, NM 87544, USA 1 second ago

Why? Because it's cold. simple as that.
42°F6°C & Clear

Wind is 2 mph4 km/h from the SE, gusting to 7 mph12 km/h
March 28
1pm45°F7°C4 mph6 km/h SEMostly Clear
2pm49°F10°C5 mph9 km/h SClear
3pm53°F12°C8 mph12 km/h SWClear
4pm55°F13°C10 mph16 km/h SWMostly Clear
5pm56°F13°C12 mph19 km/h SWMostly Clear
6pm56°F13°C11 mph18 km/h SWClear
7pm56°F13°C12 mph19 km/h SWClear
8pm54°F12°C11 mph18 km/h SWClear
9pm51°F11°C8 mph13 km/h SWClear
10pm48°F9°C7 mph12 km/h SWMostly Clear
11pm47°F8°C8 mph13 km/h WMostly Clear
March 29
12am45°F7°C8 mph13 km/h WPartly Cloudy
DateLowHighWindDayNight
March 2827°F-3°C56°F13°C7 mph11 km/h from SWClearPartly Cloudy
March 2936°F2°C57°F14°C12 mph19 km/h from WMostly ClearClear
March 3036°F2°C59°F15°C11 mph17 km/h from SWMostly ClearPartly Cloudy
March 3138°F3°C56°F13°C18 mph29 km/h from SWWindyMostly Cloudy
April 131°F-0°C44°F7°C6 mph10 km/h from WMostly CloudyPartly Cloudy
April 230°F-1°C48°F9°C6 mph10 km/h from NEPartly CloudyClear
April 330°F-1°C57°F14°C4 mph7 km/h from EMostly ClearMostly Clear

Yes

Low of 36°F2°C, High of 57°F14°C
Wind: 12 mph19 km/h
Precipitation: None

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