From Monday morning, there will be a local danger of rain freezing on the ground in Oslo, the hinterland and large parts of Viken.
Farevarsel meteorologies valid until Friday 7 January.
People are asked to be extra careful when traveling outdoors because the ice can be difficult to see, and the use of spikes should be considered.
It can also be difficult driving conditions in some places, and motorists are warned.
– Calculate extra time for transport and driving. Use the right tires and drive according to the conditions, the meteorologists write.