Earlier this week I decided to give Nik a reading skills assessment out of curiosity. He seems to be reading really well, and I wanted to see if I was imagining things. :-)
I used the first assessment in this article. It doesn't assess reading comprehension, but it was free and quick, and I was only looking for a general idea anyway.
So for the 3rd month of his kindergarten/1st grade combined year, Nik is reading at approximately a 2nd grade, 4th month level.
I plan to use the assessment a couple of times throughout the year to see how he progresses.