Yes

you do need a jacket based on the weather in St Paul, MN 55118, USA 1 second ago

Why? Because the cold's there, but it's just a reminder, not an invasion and the wind is harsh and biting!
38°F3°C & Mostly Clear

Wind is 7 mph11 km/h from the Northwest, gusting to 21 mph34 km/h
April 19
4am37°F3°C5 mph9 km/h NorthwestClear
5am36°F2°C6 mph10 km/h NorthwestClear
6am35°F2°C6 mph10 km/h NorthwestPartly Cloudy
7am34°F1°C6 mph10 km/h NorthwestClear
8am34°F1°C7 mph11 km/h NorthwestClear
9am36°F2°C8 mph12 km/h NorthwestClear
10am39°F4°C8 mph14 km/h NorthwestClear
11am41°F5°C10 mph15 km/h NorthwestClear
12pm44°F6°C10 mph17 km/h NorthwestClear
1pm46°F8°C11 mph18 km/h NorthwestClear
2pm48°F9°C11 mph18 km/h NorthwestMostly Clear
3pm50°F10°C10 mph16 km/h NorthwestMostly Clear
DateLowHighWindDayNight
April 1934°F1°C53°F11°C9 mph14 km/h from NorthwestMostly ClearMostly Clear
April 2035°F1°C55°F13°C8 mph13 km/h from SoutheastMostly CloudyRain
April 2139°F4°C57°F14°C11 mph17 km/h from NorthRainPartly Cloudy
April 2241°F5°C65°F18°C10 mph15 km/h from SoutheastRainMostly Clear
April 2344°F6°C63°F17°C5 mph9 km/h from WestPartly CloudyDrizzle
April 2443°F6°C55°F13°C9 mph15 km/h from NortheastRainDrizzle
April 2540°F5°C60°F16°C7 mph11 km/h from NortheastPartly CloudyMostly Clear

Yes

Low of 35°F2°C, High of 55°F13°C
Wind: 8 mph13 km/h
Precipitation: 23% rain

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