Hello TechSis
I don’t live in cold country like you, but painting the mailbox a dark color may help or adding some insulation. In my installation I altered the sending unit by making the magnetic reed switch remote. This allowed the sending unit to be placed outside the steel mailbox and be shielded from the weather. It is nestled in a rabbit-cut into the wood support.
To see, checkout ‘Thinking outside the metal (steel) maillbox-2’.
Good luck Victor Maletic.
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