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@Gordon
I think it might be more or less ok - the Energizer CR2032 datasheet mentions they work down to -30 degrees C: https://data.energizer.com/pdfs/cr2032.pdf
A cheaper one mentions -20 (http://www.farnell.com/datasheets/1496885.pdf) but I'd have thought it'd be ok. I guess if you do hit issues you might need to find a better battery but it definitely seems to be within sensible temperatures for a freezer.