Oslo has a wet continental climate. Temperatures in the city are softer than other cities which are located in the same latitude. In the Summer, the weather is quiet ideal, with avarage temperatures going from 19ºC (66,2ºF) to 21ºC (69,8ºF). Some years, occasionally, temperatures have gone upper, but it is not the most common situation. During the Summer months, the days are quiet long and with many hours of sun. Contrary, in the Winter months, days are very short and cold with avarage temperatures of -7ºC (19,4ºF). The main snowfalls happen between October and May, which make the city of Oslo a very famous one for practicing the ski. Some years, temperatures went so down that the waters of the fjords froze.
When to go
Unless your trip is planned exclusively to enjoy of the snow and the ski, the best moment to visit Oslo and its surroundings is the Summer, specially during the months of June and July. During this moment of the year there is a phenomenom called the “midnight sun”, because the days are very long in the South of Norway and almost without night time in the whole country. This might seem strange but it is a good opportunity to visit much better the country.