Sugar syrup is not super-saturated like honey and does not have its natural antibiotic qualities. That means you must keep your sugar syrup using the same food-safety standards that you would use for your own food. Below 40 F or above 140 F are the general rules of thumb.
Better still in my opinion, since you're only mixing up 12 lbs at a time, get a hive-top feeder and put it all on the hive at once. That way you don't have to store anything at all. Let the bees take care of it.
Mike Rossander
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