@Fury
Ah... missing data... like in China in the #GHCN daily collection. Until 2005 or so, rain gets reported diligently without any missing dates. From then on, more and more stations only report 10 days or so per month. Since 2013, no station is reporting complete anymore.
I suspect, it's China's nation-wide adoption of rain-making since 2013. Before that it was only testing and sort of voluntary. But when they went full on cloud-seeding they stopped reporting daily data to obscure success or failure.

@ai6yr