Germany's climate is almost as varied as the country itself but is mostly considered temperate. Extreme highs and lows are rare even though there have been some VERY hot summers lately, and many areas have seen little to no snow in the last few decades. (Climate change?) Winter temps vary from East to West, with around freezing in the West and well below in the Eastern parts. Summers are typically between 15°C/60F and 30°C/86F (35°C/95F being about the max). Frequent changes in weather can make forecasting difficult. To be on the safe side, always bring a sweater and some wet weather clothing when you visit.
Central and Southern Hills
Apart from the coast, the Northern regions and Southern Bavaria where weather can change quickly, Germany's climate is relatively constant. From Leipzig & Dresden to Stuttgart, the summers are warm with relatively frequent rainshowers. Winters are generally cold. Amount of snowfall and temps are influenced by altitude rather than regional climate. The weather is continental in that it varies from year to year, meaning a chilly spring and rainy summers one year can be followed by warm and sunny for both the next year. The areas around the Rhine are blessed with a particularly pleasant climate which allows for the successful cultivation of grapevines. Close to the Swiss border, the area around Freiburg/Breisgau, temperatures are generally warm enough for figs and tobacco to grow.
Baltic Coast and North German Plains
Due to the influence of the sea, the climate around Baltic Sea is fairly reliable and with little variation. The North Sea sees more rapid changes in weather. Generally speaking, the difference between seasons is less distinct than inland. However, winters can be severe with cutting winds and freezing temperatures. Summers are warm and pleasant. Rainshowers are frequent but generally don't last too long: the sunshine index is high, whilst the amount of rainfall guarantees a green and fertile landscape.
Bavarian Alps
The climate of Bavaria is similar to that of the Austrian Alps and neighboring Tyrol. Winters can be cold with frequent snowfall. Germany's highest peaks and deepest valleys offer excellent opportunities for winter sports. The South is particularly famous for its warm Foehn winds, which are notoriously blamed for everything from headaches to uncalled-for political changes. These warm-blowing winds mostly occur in autumn and spring and often account for dramatic temperature fluctuations.