I'm fluent in over six million forms of styles guide, and can readily....
You say tabular format, so I don't know how much space you have, or what kind of layout you're going for, but what about throwing some words in there for the sake of clarity?
January, between -5° and -29°
or
Temperature ranges
Month
-5° and -29°
The em dash would be my first guess, but it honestly looks clumsy.
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