The best time to visit Trezzo sull'Adda is during the spring (April-May) and early autumn (September-October) when the weather is pleasant and comfortable for outdoor activities.During these months, you'll find mild temperatures, typically ranging from 15°C to 25°C (59°F to 77°F), making it ideal for exploring the town's historical sites like the Castello Visconteo and taking walks along the Adda River. The natural scenery is particularly appealing in spring with blooming flowers and lush greenery, or in autumn with colorful foliage. These periods also generally see fewer crowds compared to the peak summer months, allowing for a more relaxed experience.Summer (June-August) is also a popular time, offering warmer weather, often reaching over 30°C (86°F), which is great for enjoying riverside activities or dining al fresco. However, it can be quite hot, and you might encounter more tourists.Winter (November-March) is the coolest season, with temperatures often dropping below 10°C (50°F) and a higher chance of rain or fog.