Disclaimer: I would not take A-Rod first, I would clearly take Pujols. I'm also a Mariner fan, so I kind of dislike A-Rod.
Having said that, let's look at his month-by-month splits:
Month, AB, Avg, HR, R, RBI, SB, [Games]
Mar/April, 91, .253, 4, 13, 7, 2, [Home: 12 , Away: 11]
May, 102, .333, 8, 22, 22, 7, [8, 18]
June, 99, .263, 7, 21, 19, 8, [17, 9]
July, 104, .288, 8, 18, 19, 3, [13, 15]
Aug, 96, .302, 5, 17, 11, 3, [12, 11]
Sept/Oct, 109, .275, 4, 21, 28, 5, [19, 10]
The first thing you should note here is his monthly numbers are better when he has more games away than at home. The next thing you should note (and has not yet been brought up in this thread) is that his first month was terrible.
I'm guessing you can blame it on the transition of being in the spotlight. Even so, June was a much better month for him even though he played way more games in NY, and yet better in the Sept/Oct stretch with even more games in NY.
What does this mean? Maybe it's a fluke, but my guess is he's getting more comfortable playing in front of his home crowd.
This doesn't mean his Home stats are going to be better than his away stats, but if he gets comfortable playing at home you can expect his numbers to increase within that split bringing his totals up slightly from last year.
Sorry, I wish I had a better point to make. When I started I was expecting the first month to be bad and to have dragged down his numbers. I was expecting to extrapolate, but now looking at these I'm a bigger believer in the home/away splits with the expectation that he'll produce better numbers the more he plays in that stadium.