Jerry Wientjes, owner of McCarran Auto Body, is accustomed to a flood of vehicles at his shop every winter.But not this one.Wientjes, whose career in automotive restoration spans 35 years, says McCarran Auto Body usually sees a roughly 70 percent increase in cars at its shop during wet winters when roads freeze and unlucky motorists spin out and crash. But the unusually dry winter means business has hovered at its normal pace of 20 to 30 cars at a time."When it snows, we can have over 100 cars," Wientjes says. "I would have to call customers and tell them, 'I …