Coginchaug valley cold and ridge wind in Durham
The Coginchaug valley holds cold air and frost, so ice at the eaves is routine on the old Main Street houses with uninsulated attics and on warm-attic subdivision houses alike. The traprock ridges to the west send wind across the valley farms and lift tabs on exposed slopes. Wooded lots on the hills trade wind for shade, moss and debris in every valley, with limbs down in ice storms. Summer thunderstorms bring gusts and occasional hail across the open fields, and spring freeze and thaw works at old chimney flashing.

