The microclimatic measurements dealt with in the present report were taken during research on the causes of the decay of the facade materials of the Pavia Certosa. The data reported complement the mineralogic and petrographic analyses and the physical and chemical laboratory tests on the sampling material taken from the facade (see oooo in this issue). The measurements taken have allowed a correct evaluation of the causes of the alterations and will form the necessary technical support for the restoration work to be carried out on the polychromous facade of the monument. The state of conservation was also historically analyzed by studying both the file documents of previous restorations and the climatic data of the area around Pavia in recent decades. -- AATA