Summer What is summer like in the Roslyn, Cle Elum area? Summer in Roslyn/Cle Elum = smoke and traffic. Smoke from fires. Traffic from many reasons. Summer in Roslyn – more and more fires and smoke each year! The pic above is the Roslyn Valley one week after the pic on top. I-90 Snoqualmie Pass – Roslyn, Cle Elum area traffic in the summer: