Although snowfall is unpredictable at long range, regular patterns do emerge over a number of seasons.
Using this data, you can tell if your preferred travel dates correspond with previous good snow conditions.
Pas de la Casa-Grau Roig
Pas de la Casa & Grau Roig are the highest of all the Andorran ski stations and they have a slightly more Atlantic-influenced orientation than their neighbours. Therefore, snowfall here is fairly reliable and snow conditions are generally stable.
The high altitude doesn't actually guarantee more precipitation, but it does mean that what does fall does so more often as snow; the condition of the snow on the ground is also better maintained as a result of the colder ambient temperatures in the thinner air. In common with the other Grandvalira ski areas, Pas de la Casa and Grau Roig are also covered by a massive network of snow cannons.
The graph below illustrates snow depth in centimetres, as measured at set points on the lower and upper slopes; figures are taken from official station communiqués.
The magic figure is 100 cm (39 in): once snow depth exceeds that mark, conditions will generally be good throughout the ski area and will usually remain so for an extended period of time.
Fig. 1 Combined average snow depth recorded over the past 3 seasons:
Seasonal Snowfall Records