Switzerland has 4 official languages: the French, the German, the Italian and the Romanche. In the territory of Geneva, near France, most of population speak French but an important part also speak German. But in general, in the city and in the country, almost everyone speaks English and it is considered one more language of the daily life.
Switzerland is a quite cold country but the weather in Geneva is moderate. The most cold months are from November to February and the hottest in the Summer, from June to September, with highest temperatures of 30ºC (86ºF). During the Winter, the mountains around the city use to be very full of snow and sometimes it is snowing in the city too. There is humidity in the city, due to the proximity to the Lake Geneva, and the winter nights are usually chilled. During the Summer temperatures are warm. The rainfalls are quite well distributed in the 4 seasons, but in Autumn it rains more than the avarage.
Swiss franc (CHF). The official currency in Switzerland is the Swiss franc, but in many places they accept euros as well. Furthermore, you’ll be able to pay with credit card almost everywhere (usually without extra charges) and at the airport you can find currency exchange offices and cash ATMs.
When to go
It depends a lot on the type of trip you want to do. During the Winter time there are many outdoor sport activities you can do, specially in the snow. Just an hour from the city there are some of the best ski resorts in Europe. During the Summer time Geneva is a good destination for escaping from the high temperatures of other parts of Europe, but also to enjoy of the long days (of light) which lets you to take advantage of the city and its environment.
3 days. Geneva can be visited in a day, but to explore its natural environment you will need a bit more. The Lake of Geneva is integrated in the city and the mountains and the nature are definetely worth to be discovered. To walk one or two days around the surroundings of Geneva can be a good idea.