moon variations

I guess this is abit of a simple(ton) question, but I can't really work it
out.

There's an amazing difference between this month's moon and the last two.

The last two months the fullish moon was yellow, and so low the trees were
obscuring it.

This month it's liike a winter moon high, way above the trees, and bright.

I'm used to the seasonal changes, but this one seems like an enormous step
change.

Is there any particular reason for this, please?

mike