Fig. 3From: Comparing leaf area index estimates in a Mediterranean forest using field measurements, Landsat 8, and Sentinel-2 dataWalter–Lieth diagram of the Presidential estate of Castelporziano for the period 1981–2020 (left) and for the year 2021 (right). Months are indicated by the letters at the bottom of the diagram. Temperature (°C) is represented on the left axis; precipitation (mm) is on the right axis. The blue blocks at the bottom of the graph indicate the probable frost months, when absolute monthly minimum temperatures are equal to or lower than 0Back to article page