It's been over a year since I last posted an update on this blog about HadISD. I suppose that's because everything has been ticking along nicely.
The dataset has been updated every month with version 18.104.22.168102p just being released. That contains data from 1-Jan-1931 to 28-Feb-2021.
In the recent update of all data in the deep past to create v22.214.171.124101p (and the new station selection that goes with that), we have filled in a gap during April 2015 which was inadvertently left in the ISD. There has been a healthy increase in the number of stations in that update as well, with now 9278 stations in the dataset.