KNMI Rain Yearbooks 1932-1990 (digital scans)

This dataset contains digital scans of the KNMI rain yearbooks covering the period 1932–1990. The yearbooks include daily precipitation observations collected by the so-called volunteer network. Within this network, the amount of precipitation over the past 24 hours is measured daily at 08:00 UTC. Before 1932, these daily observations (or a subset thereof) were included in the Meteorological Yearbooks of the KNMI. Observers recorded their measurements on a special form, which was sent by post to the KNMI each month. There, the data were quality-checked and processed into meteorological and climatological products. Since 1990, observations have been submitted digitally on a daily basis and stored directly in a database. All validated precipitation observations from KNMI dating back to 1850 are available through the KNMI Data Platform (KDP) or the KNMI website.