The Judah Baker windmill stands over the Bass River on Willow Street with its back to whatever the weather is doing, which is a decent way to run a business. Evergreen Duo Services keeps two calendars: mowing, edging, trimming, mulching and cleanups while the river is full of boats, then plowing, shoveling and sanding once the ramp is empty and the wind comes straight up the water. Yarmouth's summer lawns ask for a steady hand — sandy ground, hot weeks, growth that arrives in bursts. Its winters ask for somebody up at four. Whichever way the calendar is pointing, you step outside and the place is ready for you.