When temperatures drop, your body starts working harder almost immediately. Blood vessels near your skin tighten to keep warmth around your vital organs, blood pressure can rise by 5 to 30 mmHg, and your heart pumps against more resistance with every beat. Knowing how to dress, protect your home, and recognize warning signs makes cold weather manageable and keeps you safe.
How Your Body Responds to Cold
Cold triggers something close to a fight-or-flight response. Your nervous system constricts blood vessels near the skin’s surface, redirecting warm blood toward your core. That’s why your fingers and toes go numb first. The tradeoff is higher blood pressure and a heart that’s working harder than usual, which matters especially if you have any cardiovascular risk factors.
Your metabolism also ramps up. Cold exposure increases oxygen consumption and metabolic rate as your body burns fuel to generate heat. Research on people working in arctic conditions found caloric needs reaching nearly 4,900 calories per day, compared to about 3,100 in hot climates. You don’t need to eat that much during a regular cold snap, but your body does burn more energy when it’s cold. Eating warm, calorie-dense meals with a mix of fats, carbohydrates, and protein helps fuel that internal furnace.
Dress in Three Layers
The layering system works because each layer has a specific job. A base layer made of wool or synthetic material like polyester sits against your skin and wicks moisture away. Staying dry is the single most important factor in staying warm, because wet skin loses heat dramatically faster than dry skin.
Over that goes an insulating mid layer. Fleece jackets are breathable and unlikely to cause overheating, while down jackets provide more warmth per ounce than any other insulating material. Choose based on how active you’ll be: fleece for movement, down for standing still.
The outer shell blocks wind and rain. Look for something water-resistant with some breathability so sweat vapor can escape. Without this layer, wind cuts straight through your insulation, and rain or snow soaks it, making it useless. Cover your extremities too. A warm hat, insulated gloves, and thick socks protect the areas where your body loses heat fastest and where frostbite strikes first.
Frostbite and Hypothermia Warning Signs
When wind chill values drop near minus 25°F, frostbite can develop on exposed skin in as little as 15 minutes. The first sign is skin that looks pale or waxy and feels numb or tingly. Ears, nose, cheeks, fingers, and toes are the most vulnerable. If you notice these symptoms, get indoors and warm the area gently. Don’t rub frostbitten skin.
Hypothermia begins when your core temperature falls below 95°F. Early symptoms are easy to dismiss: fatigue, hunger, nausea, shivering, and difficulty thinking clearly. As it progresses to moderate hypothermia (below 90°F), shivering actually stops, which people sometimes mistake for improvement. Lethargy sets in, reflexes slow, and heart rate drops. Severe hypothermia, below 82°F, can lead to unconsciousness and cardiac failure. The key takeaway is that confusion and stopped shivering are red flags, not signs that someone is warming up.
Be Careful with Snow Shoveling
Shoveling snow is one of the most dangerous cold-weather activities, and it catches people off guard because it seems routine. The motion combines heavy lifting with repetitive arm work, which raises heart rate and blood pressure sharply. Your arms are doing most of the work instead of your legs, creating a disproportionate strain on your cardiovascular system. On top of that, breathing cold air constricts blood vessels further, compounding the stress on your heart.
If you need to shovel, take frequent breaks, push snow instead of lifting it when possible, and avoid going out first thing in the morning when heart attack risk is already elevated. Anyone with heart disease, high blood pressure, or a sedentary lifestyle should consider using a snow blower or hiring help.
Protect Your Home
Frozen pipes are a common and expensive cold-weather problem. Pipes in exterior walls, crawl spaces, and unheated garages are most at risk. In southern states, where plumbing is less insulated by design, pipes can start freezing at around 20°F. In colder climates, better-insulated homes handle lower temperatures, but exposed pipes remain vulnerable.
When a deep freeze is forecast, let faucets drip slightly to keep water moving. Open cabinet doors under sinks on exterior walls so indoor heat reaches the pipes. If you’re leaving for a trip, keep your thermostat set to at least 55°F.
Heating and Carbon Monoxide Safety
Space heaters, fireplaces, and gas furnaces all carry carbon monoxide risk. CO is colorless and odorless, and its symptoms (headache, dizziness, nausea, confusion) mimic the flu, which means people often don’t recognize the danger until it’s severe. High concentrations can cause you to lose consciousness or be fatal.
Install battery-operated carbon monoxide detectors near every sleeping area in your home. Have gas, oil, or coal-burning appliances serviced by a qualified technician every year, and make sure they’re properly vented. Never use a gas oven or stove to heat your home, and never run a generator indoors or in an attached garage.
Prepare Your Car
Getting stranded in cold weather without supplies can turn a frustrating situation into a dangerous one. Keep a winter emergency kit in the back seat rather than the trunk, since trunks can freeze shut. Useful items include:
- Blankets or sleeping bags to retain body heat if you’re stuck for hours
- Extra warm clothing like hats, gloves, and thick socks
- Flashlight with extra batteries
- Drinking water and high-calorie snacks like trail mix or protein bars
- Booster cables and a windshield scraper
- Sand or cat litter for tire traction on ice
- Cell phone charger that works with your car’s power outlet
If you do get stranded, stay with your vehicle. Run the engine for about 10 minutes each hour for heat, but crack a window slightly and make sure the tailpipe isn’t blocked by snow to avoid carbon monoxide buildup inside the car.
Keep Your Pets Safe
Dogs and cats are more vulnerable to cold than many owners realize. Federal animal care standards require that indoor temperatures for dogs not fall below 45°F for more than four consecutive hours. For small breeds, short-haired breeds, puppies, elderly dogs, or sick animals, the threshold is higher: 50°F.
Outdoor dogs need clean, dry bedding when temperatures drop below 50°F, and extra insulating bedding like straw or blankets below 35°F. Short-legged, short-haired, and hairless breeds are the least cold-tolerant and should spend minimal time outside in freezing weather. Cats should be kept indoors entirely during cold snaps. If your pet is lifting their paws, shivering, or seems reluctant to walk outside, they’re telling you they’re cold.
Stay Active Without Overdoing It
Cold weather doesn’t mean you need to stay on the couch, but it does mean adjusting how you exercise. Warm up indoors before heading outside, since cold muscles are more prone to strains. Cover your mouth with a scarf or neck gaiter to warm the air before it hits your lungs, reducing the blood vessel constriction that cold air causes.
Stay hydrated even though you may not feel as thirsty as you would in summer. Cold air is often dry, and your body loses moisture through breathing and through the extra effort of thermoregulation. If you’re exercising hard enough to sweat, your base layer is doing critical work keeping that moisture off your skin. Bring water and drink regularly, especially during longer outings.