As stated in the level 1 warning for Bolesławiec County:

(...) Freezing of wet road and pavement surfaces is forecast after rainfall, causing them to become icy. The minimum temperature will range from -4°C to -1°C, locally -6°C; the minimum temperature at ground level will be around -4°C, locally -7°C. Sub-zero air temperatures will persist in some places until Wednesday, 11 January 2024.

Warning valid:
from: 2024-01-04 19:00
to: 2024-01-05 09:00.