The monthly mean minimum and maximum temperatures over the year in Stockholm, Sweden. Show the average temperatures in Stockholm in Celsius Â» Data from nearest weather station: Stockholm, Sweden (0.0 Miles).
The postal service started the use of postal zones for large cities in 1943. By the early 1960s a more general system was needed. On July 1, 1963, ZIP codes were created for the whole country but they were not mandatory. In 1967, these were made mandatory for many types of mail. The system was soon used for all mail.
Pre-1960âs Zoning. The concept of postal zoning, or assigning numbers based on geographic regions, was not new to the 1960âs ZIP Code campaign. The basic idea of postal zoning came into being in 1943, in the midst of World War II.