I am not quite sure what kind of answer you are looking for, John, but here are some of my thoughts:
I would say our place in Sithonia, Halkidiki (Greece) has a very typical Mediterranean climate, with hot, dry summers and most (around 90 %) precipitation during winter. Mean annual temperature is about 16 °C, mean annual precipitation is 500-700 mm. It is strange in a way, the amount of precipitation isn’t that much lower than in here in Oslo, but it certainly does not feel as dry here in the north, I guess the temperature makes the big difference.
But exactly where would I draw the line for what I could call the Mediterranean region? I find it easier to define it as the countries around the Mediterranean Basin, and accepting that there are great variations within that area. We have a small mountain area not far from our Greek house on the coast, it does not take much more than half an hour to get into the Holomondas, up to 1200 m above sea level, which is cooler and it rains more often in the summer in summer, and it regularly gets snow in the winter, but I would still say it’s a Mediterranen area.