*What triggers a rainy day?
A rainy day is a day with a total rainfall strictly superior at 1mm. I don't now if the norm take strictly 1mm as rainy day.
*What could be the reason for Tn showing NA in the stats?
This is a bug, it will be corrected in next release.
*I have a solar sensor and counts sunshine hrs. (A cumulative seconds database) Is it possible to get GW to calculate hrs of sunshine for the periods? ie $cumul[solar_time]/3600seconds=hrs of sunhine?
For moment the stats on the solar radiation are basics, but the improvment will come with the next release.
*Last Question. Is it possible to plot solar radiation on a logarithmic scale?
No, but logarithmic scales are on the todo list
Antoine.