Weather
In summer, the hottest days may reach 95 F/35 C, but temperatures are usually mild, ranging in the 50s-70s F/10-25 C. Winter extremes can see temperatures plunge to -13 F/-25 C, with average highs in the 20s F/-2 to -7 C. The coldest months are January and February; the hottest are July and August.
The best time to visit is April-September. Although if you visit Oslo in winter, there are also many fun activities to try in the snow.