Charging system test. What numbers are important, and is CCA good enough?

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Had charging system tested battery tested "good" 12.59V 930CCA rated 770CCA temp was 65 degrees though. What about below zero temps an wind chill? Starter tested 11.22V 217.2Amps Charging test No load 14.74V Loaded 14.65V I would rather not replace battery if not needed