If your eczema gets worse every winter, you are in good company. Cold, dry weather is the most widely recognized eczema trigger, and there is a clear physical reason for it. This is a deep dive into how cold and dry conditions affect eczema prone skin, part of our larger guide to eczema and weather. It is also the pattern our forecast weighs most heavily, because for many people it is the single biggest driver of a flare.
Why cold and dry air is hard on eczema prone skin
Eczema prone skin has a weakened barrier that struggles to hold moisture. Cold winter air holds very little water, and when the surrounding air is dry, moisture leaves the skin faster. That accelerates the drying and cracking that lead to itch, redness, and flare. Dermatology organizations and a large 2025 review of the research both describe cold and dry conditions as recognized triggers for exactly this reason.
It helps to think about dew point rather than temperature alone, because dew point reflects how much moisture the air actually holds. Low dew point days are the driest for your skin, and they are common in winter and in dry inland climates. That is why our forecast weighs dew point most heavily in its cold and dry calculation.
The parts of a cold, dry day that matter
Cold, dry weather is really several stresses acting together.
Low humidity and low dew point
This is the core of it. Dry air pulls water out of the skin and weakens the barrier. It is the most direct driver in the whole cold weather pattern.
Cold temperature itself
Beyond drying the air, cold reduces skin barrier function on its own and can prompt an inflammatory response in sensitive skin. Cold and dry usually arrive together in winter, which is why they reinforce each other.
Indoor heating
The outdoor cold is only half the story. Forced air heating dries indoor air even further, sometimes below the humidity outside. People move between cold, dry streets and warm, dry rooms all day, and both pull moisture from the skin. Indoor heating is one of the most commonly overlooked winter triggers.
Wind
Wind speeds up evaporation from the skin surface, so a cold, dry, windy day is often harder than the temperature alone would suggest. Our forecast treats wind as an amplifier of the cold and dry pattern rather than a driver on its own.
Not everyone is a winter person
Here is an honest and important point. Not everyone with eczema flares in winter. Research has found that people split into different groups. For many, eczema is a cold, dry, winter condition. For others, it is worst in the hot, humid summer. Two large studies even pointed in opposite directions on temperature, which reflects real differences between people rather than a mistake. We explain how our forecast handles this on our methodology page. If cold and dry is not your pattern, our hot and humid guide may fit you better.
Why your city matters
Because dry air is the real driver, geography changes the picture. A cold but humid coastal winter can be much easier on the skin than a cold, dry inland winter. Dry mountain and northern inland climates tend to produce the hardest winter conditions, while milder, more humid areas are often gentler. This is exactly why a single national number is not useful and a local estimate is. You can look up your own area on the eczema flare forecast to see how strong the cold and dry pattern is where you live, day by day.
Preparing for cold, dry stretches
Knowing a cold, dry, windy stretch is coming gives you a chance to prepare rather than react. Dermatology organizations commonly suggest general strategies for dry winter skin, such as moisturizing regularly and especially right after bathing, running a humidifier to raise indoor humidity, using lukewarm rather than hot water, and protecting skin from wind and cold. These are widely shared educational suggestions, not personal medical advice, and what actually works for you is best worked out with your own clinician. The value of the forecast is timing. It tells you when conditions are likely to be harder so that whatever routine works for you is already in place.
When to see a healthcare provider
Weather awareness is a helpful tool, not a substitute for care. Consider seeing a healthcare provider or dermatologist if your eczema is severe, is not improving with your usual routine, is disrupting sleep or daily life, or shows signs of infection such as oozing, crusting, warmth, or increasing pain.
Frequently asked questions
Why is my eczema worse in winter? Winter air is cold and dry, and indoor heating dries the air further. Both pull moisture from the skin and weaken its barrier, which drives itch and flare. Wind adds to the drying. For many people this combination makes winter the hardest season, though not for everyone.
Does dry air cause eczema? Dry air does not cause eczema, but it is a common trigger for flares in people who already have it, because it speeds up water loss from an already weakened skin barrier.
Is it the cold or the dry air that is the bigger problem? Dry air, meaning low humidity and low dew point, is the more direct driver. Cold usually makes things worse because it comes with dry air and because indoor heating dries the air even more.
What indoor humidity is comfortable for eczema prone skin? Many people find a moderate indoor humidity level more comfortable than very dry heated air, which is why humidifiers are commonly suggested in winter. The right level for you is best discussed with your clinician.
Sources
The relationships above draw on peer reviewed research and dermatology authorities, including a 2025 systematic review of climate, weather, and air pollution in atopic dermatitis, clinical guidance on winter eczema from the Cleveland Clinic, and educational resources from the National Eczema Association and the American Academy of Dermatology. Full source links are listed in our references and were verified before publication.