This visualization shows six line charts tracking temperature metrics for three cities in both Fahrenheit and Celsius across a year, switchable via a dropdown menu. The SVG is rendered with D3 v5, and the lines use an ordinal color scale and cardinal curve interpolation. A hover interaction uses a bisector to locate the nearest date, displaying a vertical guide line, date label, and city-specific values with formatted degrees. The y-axis transitions smoothly when switching units.