The data consists of Oir river and its tributaries water temperature since 1986 collected for the Environmental Research Observatory (ERO) on Diadromous Fish in Coastal rivers (DiaPFC). ORE DiaPFC is a research infrastructure focused on studying the evolution of diadromous fish populations under the influence of human-induced and environmental changes (mainly agriculture and climate). Oir river: Latitude ranges from 48.6840 to 48.5985; longitude ranges from -1.2949 to -1.0994 and elevation range from 9 and 80 metres. The Oir River is located on the southern edge of Normandy. It is a tributary of the Sélune, a coastal river that flows into the Bay of Mont Saint-Michel. The Oir is 21km long and has a mean gradient of 1.1%. Annual mean discharge is 1.1m3/s and the drainage basin area is 85.4km2. Geologically, the basin is dominated by sedimentary schist and metamorphic hornfels with granite inclusions. The water has nearly neutral pH and reasonably good quality except for high nitrate concentrations. Agriculture is the main human activity and land use.

The dataset consists of 2 files, one with the description of the monitored sectors and the other with the collected data (Sector, Date, Time, Temperature).