Amount of Data According to 50-Year Periods
The numerical significance of the daily weather observations, the long series of instrumental measurements and other continuous weather data is reflected in the development of data according to fifty-year periods. After 1900 only few long series remain. Prior to 1550 the data are defective, to a lesser extent those in the period 1600 to 1649. Additional data for those less documented periods, but also for the other ones are welcome.