Hourly and validated automated in-situ ground-based meteorological surface observations in the Netherlands

KNMI collects meteorological surface observations from automatic weather stations (in-situ) situated in the Netherlands and BES islands. The network consists of sea and land-based locations, including wind poles and sites at airports. The weather stations report every 10 minutes meteorological variables such as temperature, relative humidity, wind, air pressure, visibility, precipitation and cloud cover. The 10 minute observations are aggregated to hourly values once per day.

The number of available variables differs per station. The data for the hourly intervals is validated by KNMI experts, filling gaps and correcting measurement errors, after which it becomes available. The expert validation can take up to several days to complete. The file contains a timestamp denoting the end of the observation interval in UTC.