I am planning to add station data to the GHCN V3 monthly portal. Not monthly data which would be cumbersome, but annual average. This is useful for plotting and trends.
There is a trial below. Each link leads to the NOAA GHCN station summary, as before, but the radio button brings up a page with a table of the annual averages, along with a brief metadata and a map (the station is in the middle). There is a table for unadjusted data, and below for adjusted. Both are then repeated in CVS format, for import into Excel. The table of links is searchable (Ctrl-F), and can take a while to load. I'll probably add a graphing and trend calculation capability.
In calculating the annual averages, I eliminated years with less than 9 months data. I also (before) removed data with flags indicating unreliability. Then I infilled missing months with the overall mean for that station/month (else seasonal effects add a lot of noise). Then I calculated the simple average of the infilled data.
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