Weird. I remember trying to figure it out (and failing) when I first got BW1 and made little sandboxes for myself on it.
Then I found an editing guide that says how to use it... then I lost that and haven't been able to find the updated (with climate commands) version.
That would do, I think. But I seem to remember there being more variables that were known then. (like, for example, I think the "120.000000" (size of climate) are both the smallest size and largest size. But I'm not sure, so don't take my word for it :0)