Yes

Based on the weather in Thessaloniki Airport Makedonia (SKG), EO Aerodromiou Thessalonikis, Thessaloniki 551 03, Greece as of January 21, 2018 11:54pm local time

Why? Because it's cold. simple as that.
Current Conditions
Drizzle
Temp: 46.4°F8°C
Wind: 3.9 MPH6.3 KPH
Precipitation: 44% rain