Sorting posts by time and category (How?)

Hello,
When WP queries my posts in the while loop, I imagine there is a list of posts, which is works its way down, posting each in turn. The problem is, that I don’t want my to post like that!
I want my posts to post by Time, and then category.
E.G
Spring: (That is a time period)
Posts in category 1
posts in category 2
Winter: (This is the next time period)
Posts in category 1
posts in category 2

My problem is that my time periods (The seasons) have somewhat arbitraty relation to the actual date, and obviously I don’t want to write a new loop for every Season!

Any help, really appreciated, this is driving me mad now!
A

P.S In the hope that someone might provide new and unique solution, I have not posted my code ideas – though you can find it in other posts.