Hourly observations from aerodroms have been used to calculate hourly means of the most important climatological variables. For those varibles showing a marked daily and annual variation isopleth diagrams have been analysed for air temperature, humidity and wind velocity. The results are given for 11 places. The period used is in general the years 1955-1975. In the text short comments are given to the different diagrams. Some differences and similarities between stations have been pointed out.