As mentioned in the notes, it's not possible to have a completely clear sky as the fog effect is always active. So even at extremely low density values, the distant horizon including the sky will be obscured somewhat. The effect differs from track to track. Many tracks have a distant horizon which will always be obscured while some tracks, such as Monaco, have a closer horizon and aren't obscured as much.
Even if it were possible, I don't think a completely clear sky is realistic for a weather patch as typically rain and fog don't go from pea soup conditions to unlimited visibility in a short time.
There were several technical challenges that had to be overcome for the patch. Getting it to work well offline was relatively easy, but ensuring that all online players see the same fog density at the same time, but still using random changes for variety was tough. As you know, online player can join the server at different times which greatly complicates things.
I also spent several days trying to get the cars to display spray behind the tires. I succeeded in getting one or sometimes two cars to do this and it is a cool effect, but I couldn't get all cars to do so.
No worries man: it's always a great thing to see nonetheless. We all appreciate greatly your work, I just thought that giving my two cents would be useful for a feedback
Also... spay behind cars? Oh boy, that would be complete madness in the back end of the pack. I hope some day someone finds the way to do it (I would love to, but I don't know ::crap:: about coding in Python and how it links to GPL ^^; )