a1c is the average, but it is also important to see the
fasting numbers. Sometimes early in diabetes only the
fasting numbers may be high, and paying attention to these may give a heads up on taking action.
Ideally fasting is < 100 (and even better if it's in the 80s). Normal non-diabetic a1c is < 5.0, though you may not get diagnosed as diabetic until you are 5.7 or higher.