Some flying destinations advertise with comments such as "flyable over 300 days per year". When people ask me to quantify flyable days per year in Piedrahita I can confidently say 365 days per year. It is always flyable everywhere! However, you may not enjoy the experience or necessarily survive it.
There are days when it is just not worth trying due to wind strength or storm activity. There are plenty of other things to do here. So we do them, rather than wasting the day in the forlorn hopes of a flight. Many of our alternative activities can be fitted in during a non flyable part of the day, and we prefer to do that rather than wasting the whole day driving or waiting.
Hourly observations at various points around the province. The village of Navarredonda de Gredos is on the plateau behind Peña Negra, which gives us a good reading of winds at take off height.
The wind strengths and directions also give an idea of possible convergence areas and how the day is developing.