I know the average SR (for monsters who have it) is CR+11 but what is the average AC (if there is one)? I think maybe CR+15 or so?
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This table are the official guidelines for creating monsters for various CR.
This table is an average of the stats for published monsters in the bestiary.
OK thanks. Looks like my guess was pretty close to right.
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For the median the formula is roughly 11.75 + 1.25*CR. While that's close to 15 + CR, the factor of 1.25 is important on the long run. It means that with full BAB alone you can't keep up with the increasing AC - you need to improve weapon enhancement bonuses, ability scores, class powers and probably buffs.
I like to think in "quarters" here, bonuses of roughly 0.25 per level. Each quarter gives you +1 to AB within 4 levels:
Full BAB: 4 quarters (+4 AB over 4 levels)
Medium BAB: 3 quarters (+3 AB over 4 levels)
Weapon enhancement: 1 quarter (+3 weapon at level 12, for example)
Ability scores: 1 quarter (+2 AB from +2 regular increases and +2 item increases at level 8, for example)
Class powers: 1 quarter (+1 from weapon training roughly every 4 levels, for example)
Buffs: varies a lot
If you can make it to 5 quarters (factor 1.25), you can at least keep up with the increasing AC - might be good enough for a secondary martial. For good progress you need 6 quarters, though.
There are also things which drag you down:
Power Attack / Combat Expertise / Deadly Aim: -1 quarter
Iteratives: -1 quarter in average, varies between -0 and -2 quarters (level 6 is harsh, for example: -0 AB and -5 AB means -2.5 AB in average, so about -0.417, nearly -2 quarters)
So you should aim to compensate them, get rid of them (sooner or later) or accept the reduced accuracy for other benefits (damage is the most obvious).