Just as what the term suggests, fog lights are used when driving in hazardous conditions like when it is foggy or the weather is bad for that matter and the driver is having a hard time seeing the road. However, these types of lights must not be used when the weather is just fine as they can blind the other incoming vehicles.
This does not mean though that it will be okay for you not to have fog lights on your vehicle just because you happen to be in a country that hasn’t seen snow ever since...