Hi Steve
There's no "astronomical" standard for seeing, but a few people like to use the "pickering scale". Damian Peach has a good article on good locations for seeing, and the pickering scale:
http://www.damianpeach.com/seeing1.htm
I use 0-10 as a scale, but it can be very hard to judge sometimes - especially if you haven't experienced 9+/10 seeing.
Transparency is tricky too - if it's cloudy, then I don't believe that's what transparency is there to record. It's for how "clear" or "dark" the sky is when there's no clouds. High haze, dust, light pollution, fog etc can all affect transparency.