This section of the Via Romea Germanica runs from the Po Valley lowlands across Apennine passes into Lazio, bringing varied weather by elevation and exposure. From seasonal patterns along this route, April, May, and September align with milder temperatures, longer daylight, and generally steadier conditions for the crossings. Outside these windows, persistent summer heat burdens lowland stretches, while winter shortens days and can bring snow and ice over the mountains.