In the picture you can see a nice shot of Saint Peter's Cathedral and the Rhone River.
The best time to come to Geneva is June, when temperatures are mild and the European vacationers have not yet arrived. If you cannot come in June, try September or October. In August the weather is usually fine. The problem is the crowds. Coming in winter is recommended for the ski fans. Weather is never too extreme here.
To have an idea of the temperatures year round, here is a list of average temperatures: December-February, 36°F (2°C); March, 42°F (6°C); April, 50°F (10°C); May, 60°F (15°C); June-August, 62°F (18°C); September, 60°F (16°C); October, 52°F (10°C); November, 45°F (5°C).