Yes

you do need a jacket based on the weather in Buttwil, Switzerland 1 second ago

Why? Because your nose hairs will turn into tiny icicles!

32°F-0°C & Mostly Cloudy

Wind is 1 mph1 km/h from the Northeast, gusting to 1 mph2 km/h

Date	Low	High	Wind	Day	Night
February 2	31°F-0°C	35°F2°C	1 mph2 km/h from Northeast	Mostly Cloudy	Mostly Cloudy
February 3	29°F-1°C	40°F5°C	1 mph2 km/h from Northeast	Mostly Clear	Mostly Clear
February 4	29°F-2°C	42°F6°C	2 mph3 km/h from North	Mostly Clear	Mostly Clear
February 5	30°F-1°C	36°F2°C	5 mph9 km/h from Northeast	Cloudy	Cloudy
February 6	30°F-1°C	37°F3°C	4 mph7 km/h from Northeast	Mostly Cloudy	Mostly Cloudy
February 7	29°F-2°C	37°F3°C	2 mph4 km/h from Northeast	Mostly Cloudy	Mostly Cloudy
February 8	29°F-2°C	38°F3°C	2 mph3 km/h from Northeast	Mostly Cloudy	Cloudy

Low of 29°F-2°C, High of 40°F5°C
Wind: 1 mph2 km/h
Precipitation: None