Ariège stands on the eastern limit of oceanic dominance over rainfall, but other influences are felt:
- Mediterranean – particularly visible in the vegetation of the foothills and of the valley of the Ariège river towards Tarascon, and in the Pays de Sault;
- Continental – in the Pyrenean valleys, with many storms and big differences of temperature between day and night.
There is no great tendency to summer drought as the flow of air from the north-west brings rain throughout the year. Rainfall is moderate on the foothills and in some sheltered valleys, measuring 700 to 1,000 mm per year, but increases significantly in the higher valleys with levels between 1,000 mm and 1,800 mm. The slopes exposed to the north-west, such as Aulus and Orlu, are, as one would expect, the wettest, together with the frontal ridges that meet air flow from the southwest (giving rise to the Foehn effect). Snow cover is common over 1,000 metres, lasting several months above 1,500 to 2,000 metres. Some periglacial areas exist over 2,500 m but the only true glacier in Ariège is that of Mont Valier, near Castillon-en-Couserans.
Temperatures are mild in the foothills, e.g. at the city of Foix (400 metres) the average is 5 °C in January and 19 °C in July. However, they decline rapidly with elevation, e.g. at l'Hospitalet-près-l'Andorre (1,430 m) it is 0 °C in January and 14 °C in July.
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