Drink warm beverages. A hot-water bottle is useful, especially on car trips. Consider moving to a warmer climate. Protect your hands from the cold. Mittens are far more effective at keeping your hands warm than gloves, since they pool the heat from the entire hand.
Damp cold is the most likely to precipitate an attack.
Never clean vegetables under cool running water. Use warm water or, better yet, take advantage of the prepared vegetables available in produce departments. Start running your bath or shower ahead of time so that you don't touch cold water. Make sure your hose doesn't leak. Use insulated cup holders for cold beverages, and use straws.