I suppose Celsius and 90 is a poetic exaggeration for 35+, while 30 being realistic for inside a stone-building mid-summer in Italy. Alternatively, Fahrenheit,

I suppose Celsius and 90 is a poetic exaggeration for 35+, while 30 being realistic for inside a stone-building mid-summer in Italy. Alternatively, Fahrenheit, and 90 is realistic for outdoors mid-summer in Italy and 30 is a poetic exaggeration for ~80 inside a stone-building. If meant literally, the holy water would freeze inside the cathedral. Besides, nobody uses Fahrenheit in Europe, but poetic exaggeration is common.