With the assassination of President McKinley, Theodore Roosevelt, not quite 43, became the youngest President in the Nation's history.
Average Temperatures in Oslo, Norway. 1  The average annual temperature in Oslo, Norway is cool at 5.7 degrees Celsius (42.3 degrees Fahrenheit). 2  There is a variation of average monthly temperatures of 20.7 C (37.3 F) which is a below moderate range.3  There is a range/ variation of mean daily temperatures of 7.3 C (13.2 F). There is a range/ variation of mean daily temperatures of 7.3 C (13.2 F). 2  The warmest month (July) is very mild with an average temperature of 16.4 degrees Celsius (61.52 degrees Fahrenheit). 3  The coldest month (January) is slightly cold having a mean temperature of -4.3 degrees Celsius (24.26 degrees Fahrenheit).
The Oslofjord has Norwayâs highest all year temperature: 7.5 degrees Celsius. February is the coldest month in the fjord with -1.3 degrees Celsius, while July normally has 17.2 degrees Celsius. The islands in the middle of the fjord are among Norwayâs warmest with high summer temperatures and moderate winters.he Oslofjord has Norwayâs highest all year temperature: 7.5 degrees Celsius. February is the coldest month in the fjord with -1.3 degrees Celsius, while July normally has 17.2 degrees Celsius. The islands in the middle of the fjord are among Norwayâs warmest with high summer temperatures and moderate winters.