Tomatoes (var.) need specific amounts of hours of sunlight before they flower and fruit; the different varieties vary ;-) so you need to match your particular micro-climate.  

Other veggies have their own requirements and there are varieties that will certainly do well no matter where one lives.  The easiest way to discover which one(s) do best is to toddle on off to the local gardening club and start asking.  In my experience this not only assures you of more information than you care to know finding the right seeds but also a source for the right seeds.

She believed in nothing; only her skepticism kept her from being an atheist. -- Jean-Paul Sartre