In subtropical Silicon Valley, we think it's really cold when the day's high temps are only in the 40s. This morning started off quite chilly here, with frost gracing cars and houses all along my Los Gatos street. Rain was forecast so we were watching the nearby hills to see if they would get snow too.

When I bundled up to grab the morning paper, I noticed that many of my neighbors' homes had frost on them - but to varying degrees. We're in a time when folks are more conscious about saving energy and also saving a buck, but apparently many don't understand what the roof in winter can tell us. . . .

To learn why it matters and to see some photographs of roofs and their frost, please read the post on my Valley of Hearts Delight blog,

What Can You Learn from a Silicon Valley Roof on a Frosty Morning?