Yes

you do need a jacket based on the weather in NASA Ames Research Center Boundary, Mountain View, CA 94043, USA 1 second ago

Why? Because it's bitterly cold.
46°F8°C & Cloudy

Wind is 3 mph5 km/h from the S, gusting to 6 mph10 km/h
March 29
6am46°F8°C3 mph6 km/h SCloudy
7am46°F8°C4 mph6 km/h SCloudy
8am47°F8°C4 mph7 km/h SCloudy
9am47°F8°C5 mph8 km/h SECloudy
10am48°F9°C6 mph9 km/h SECloudy
11am49°F10°C7 mph11 km/h SEDrizzle
12pm50°F10°C8 mph13 km/h SEDrizzle
1pm52°F11°C10 mph17 km/h SEDrizzle
2pm54°F12°C12 mph20 km/h SECloudy
3pm55°F13°C14 mph23 km/h SEDrizzle
4pm55°F13°C15 mph23 km/h SERain
5pm55°F13°C14 mph23 km/h SERain
DateLowHighWindDayNight
March 2946°F8°C56°F13°C11 mph18 km/h from SERainDrizzle
March 3047°F8°C62°F16°C6 mph9 km/h from ERainPartly Cloudy
March 3146°F8°C64°F18°C5 mph8 km/h from WPartly CloudyMostly Clear
April 145°F7°C70°F21°C4 mph7 km/h from NClearClear
April 245°F7°C73°F23°C4 mph6 km/h from NWClearMostly Clear
April 348°F9°C68°F20°C6 mph9 km/h from WPartly CloudyMostly Clear
April 444°F7°C59°F15°C10 mph16 km/h from NWMostly ClearPartly Cloudy

Yes

Low of 47°F9°C, High of 62°F17°C
Wind: 6 mph9 km/h
Precipitation: 57% rain

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