Climate and People in Berlin

The climate in Berlin is moderate. Summer can be very hot and quite unpleasant. The winters are generally mild, but there are also harsh cold spells.
Warm clothing is a good idea even in summer, since it occasionally gets quite cool at night. There are hardly any social dress requirements.
Berliners are quite rough in general and can seem fairly brusque at times. Having said that, typically as a visitor you will find yourself overwhelmed by offers of assistance or information you may actually not need!
Underground, or ‘U Bahn’ rides could be interesting if you have the time to eves drop in on conversation. You may hear some stories revealing more about the city and its people which could be more useful than a guide book.
Language wise, Berlin is a smelting pot of dialects and cultural influences. You will find a lot of Yiddish and Hugenot influence, believe it or not! There are also traces of Swabian and Saxon in accents. Nearly everyone speaks English though, usually a little broken, but more than good enough to be understood for tourist purposes!