its australia specific, but what about the public funded BOM api? well maybe not an API so much as an FTP data source.
for example, getting evapotranspiration figures, you go here — ftp://ftp.bom.gov.au/anon/gen/clim_data/IDCKWCDEA0/tables/wa/perth_airport/perth_airport-202108.csv
the IDK… defines the product.. the clim_data defines the category as per http://reg.bom.gov.au/catalogue/anon-ftp.shtml
could this be used as a post-dark sky thing in the years to come?