It is situated on the former Route nationale 618, the Route of the Pyrénées. Arreau is at the crossroads of the Louron valley and the Aure valley.
Geography
Climate
Arreau has an oceanic climate (Köppen climate classificationCfb). The average annual temperature in Arreau is 9.6 °C (49.3 °F). The average annual rainfall is 894.8 mm (35.23 in) with November as the wettest month. The temperatures are highest on average in July, at around 17.6 °C (63.7 °F), and lowest in January, at around 2.0 °C (35.6 °F). The highest temperature ever recorded in Arreau was 38.5 °C (101.3 °F) on 30 July 1983; the coldest temperature ever recorded was −23.0 °C (−9.4 °F) on 3 February 1956.
Climate data for Arreau (1981−2010 normals, extremes 1943−2015)