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"I've come to the conclusion that the only way to get any information on the
probability of seeing a sunrise/set is to build myself a sun detector and I
would like to post my idea to get some feedback."

Ok, here's some feedback: buy an alarm clock, a pencil, and a notebook.
Seriously, you are talking about the simplest astronomical observation that
exists. Set your alarm clock for the time of sunrise, get up and walk to the
window. See Sun? Put a mark in the notebook. I suggest a letter 'S'. Can't
see Sun? Put a different mark in the notebook, perhaps a letter 'N'. You can
expand on this system as time and interest permit... What you really need
are some students. Assign it to them as a year-long project. Then you can
sleep in. 

Kidding aside, I agree with Marcel that there is plenty of data available
already. At minimum, you can rule out sunrise visibility when the sky cover
is listed as 'overcast' or 'fog'. If you throw in some observational data of
your own, you ought to be able to estimate a probability of sunrise/sunset
visibility when conditions are 'mostly cloudy' and 'partly cloudy'.

 -FER


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