Other data sources

[AdamRJensen]

It would be nice with a page with a list of alternative sources of data (lower quality):

Research stations in Antarctica Ladybug - collection of EPW/TMY weather files Overview of reanalysis datasets

CANSIM - Canadian network with 7 stations measuring spectral irradiance using Spectrafy sensors.

Eye2Sky network of all-sky cameras near Oldenburg, Germany other link

Oklahoma Mesonet (weather stations with LI-COR pyranometers): website, paper

German Weather Services - Deutscher Wetterdienst (DWD) also operates a network of 25 sites measuring global horizontal irradiance and diffuse irradiance with thermopile pyranometers with a resolution of 10 minutes.

https://natural-resources.canada.ca/energy/renewable-electricity/solar-photovoltaic/18409

https://www.fdr.uni-hamburg.de/record/12548

http://globalsolaratlas.info/

[IoannisSifnaios]

There is also this report from MINES Paris including some stations.