There is no special rainy season
Avg. Temp. in Spring: max.: 10 – 19°C ( 50 - 66°F ); min: 1 - 8°C ( 34 - 47°F )
Avg. Temp. in Summer: max.: 22 – 24°C ( 71 - 75°F ); min: 11 - 13°C ( 51 - 55°F )
Avg. Temp. in Autumn: max.: 7 – 19°C ( 45 - 66°F); min: 2 - 10°C ( 36 – 50°F )
Avg. Temp. in Winter: max.: 3 – 6°C ( 38 - 43°F); min: 0 - 1°C ( 32 - 34°F )
Good walking shoes. Outdoor clothing if you intend to trek.
Photo Equipment: Germany is cheaper than most other places I know in Europe and you find equipment everywhere. You will want to buy loads of film for this photogenic part of the world.
Miscellaneous: A corkscrew...