Another consideration to keep in mind is current. If you sail on salt water, the tidal currents can determine whether sailing is feasible or not. If you have an outgoing tidal current of 3 knots and only a 4 knot sea breeze, chances are pretty good you won't be sailing back...
Feeling very good .. aware that in some measure I am learning ..
I read down this post .. and wanted to add tidal currents .. before I saw that sailingdog had already talked about this ... as I spent close to 7 hours on San Francisco Bay today .. some of it (but not much) wallowing .. most of it sailing .. abit of it .. trying to sail back just as sailingdog described .. sitting on my Cal 28 at the moment .. reviewing the lessons I learned today ..
I would like to recommend that you get a copy of David Seidman's book, The Complete Sailor .. I've read it cover to cover now 3 times .. and continue to learn .. and am just starting to understand ..