Naugatuck valley weather on Ansonia rooftops
The valley holds damp and fog, and the close-set downtown streets are shaded, so moss and slow drying are common on north slopes. Inland winters are cold, with snow that sits on flat sections and ice at the eaves of houses whose attics were never insulated. The hillside takes wind up the valley, and snow slides off steep roofs onto porches below. Freeze and thaw works at old chimneys and flashing all season, and summer heat on dark flat roofs ages the membranes.

