Yes

you do need a jacket based on the weather in Ostrava, Czechia 1 second ago

Why? Because it's snowing and it's cool enough your breath is visible, but your nose isn’t red yet!
34°F1°C & Snow

Wind is 7 mph12 km/h from the Northwest, gusting to 18 mph29 km/h
March 17
1am34°F1°C8 mph13 km/h NorthSnow
2am34°F1°C11 mph18 km/h NorthSnow
3am32°F-0°C14 mph22 km/h NorthSnow
4am31°F-0°C14 mph22 km/h NorthCloudy
5am33°F1°C14 mph22 km/h NorthMostly Cloudy
6am35°F2°C14 mph23 km/h NorthPartly Cloudy
7am36°F2°C15 mph24 km/h NortheastPartly Cloudy
8am37°F3°C15 mph24 km/h NorthWindy
9am38°F3°C15 mph24 km/h NorthWindy
10am37°F3°C15 mph24 km/h NorthMostly Cloudy
11am36°F2°C14 mph22 km/h NorthMostly Cloudy
12pm35°F2°C12 mph20 km/h NorthMostly Cloudy
DateLowHighWindDayNight
March 1628°F-2°C38°F3°C13 mph22 km/h from NorthSnowClear
March 1724°F-4°C42°F5°C3 mph4 km/h from WestClearClear
March 1827°F-3°C49°F10°C7 mph11 km/h from SouthwestClearClear
March 1929°F-2°C54°F12°C8 mph13 km/h from SouthwestClearClear
March 2033°F1°C59°F15°C6 mph10 km/h from SouthwestClearPartly Cloudy
March 2135°F2°C59°F15°C5 mph8 km/h from EastMostly CloudyPartly Cloudy
March 2241°F5°C58°F15°C7 mph12 km/h from SouthPartly CloudyMostly Cloudy

Yes

Low of 25°F-4°C, High of 42°F6°C
Wind: 3 mph4 km/h
Precipitation: None

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