Temperatures below zero degrees Celsius

[Behemot]

I hope this is the right forum for this, if not please move it to the correct one:

I live in Norway, and from November to February temperatures are often below Zero degrees Celsius (i.e. freezing), especially during the night. The carrier used by Amazon normally shows up sometime during the night (from midnight to 3-4 AM) and leaves my parcels outside on my doorstep for me to collect in the morning.

I am worried that Blu-rays and UHDs will be damaged when they are left outside on my wooden porch at freezing temperatures (no more than minus 5-10) for up to 6 hours in the night. Is this something I should be worried about, or is this unproblematic?