I modified a timecyc file of PROJECT REALITY (I don't know which version), and I use tool "timesync1.81" to change weather in real-time ;)
PROJECT REALITY of dinuxx :
http://www.gtaforums.com/index.php?showtopic=387104&hl=project%20reality&st=0
Timesync 1.81 :
http://www.thegtaplace.com/downloads/file.php?id=1246
ENB version is always the same with some variations according to the city or the time where I want to take the screenshot .
I just discover PROJECT REALITY, and is a super mod, so I do more tests ;)