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102 homogenised stations 1910-now (raw),
240 homogenised stations 1951-now (raw)
The raw data are from the 8-8 observational network, the day is the day of the observation, most rain fell on the previous day. The homogenised set has been corrected statistically for breaks in the monthly sum in comparisons with neighbouring stations. The lowering of the observation height from 1.5m to 0.4m around 1950 has not been corrected for. This reduced the undercatch by about 3% but the correction depends strongly on the location and weather. A first order correction for measurement problems 2012-2017 has been added.
Approx. ~300 dutch 8-8 stations (1906-now, KNMI): all stations, as an ensemble, maximum precipitation, number of stations. Uncorrected except for the first order correction for measurement problems 2012-2017. (Average precipitation on 13 dutch stations 1906-now, KNMI)
These observations are from automatic rain gauges, which on average record about 5% less rain than the manual rain gauges of the 8-8 network.
The daily precipitation deficit, cumulative Makkink evaporation minus precipitation (set to zero when negative):