This visualization pairs a daily river temperature (rtb) scatterplot for 2015 with a linked weather chart. The left SVG shows each day as a circle, with hover interactions that highlight the point, display a tooltip, and update the right SVG to show that day's hourly temperature data. The right chart uses a line plot built with d3.scaleLinear and d3.line. Data is loaded from CSV files, and both charts use d3.axisBottom and d3.axisLeft with animated transitions for hover feedback.