How does weather impact eczema flare-ups?
January 20, 2026
- Google Trends search volume for the term "eczema" shows a direct correlation with temperature and humidity.
- A simple regression model, using these temperature and humidity as predictors, explains about 20% of the variation in "eczema" search volume.
- Flare-up risk increases based on relative temperature changes, but absolute humidity changes.
Enter your zip code to see the weather's impact on your eczema flare-ups chances.
How did we determine the relationship between weather and eczema flare-ups?
Many people with eczema notice that their skin gets worse when the weather changes, but it’s hard to tell exactly how weather plays a role. To study this, I built a statistical model...
The results matched what many people already suspect: eczema tends to worsen in cold, dry conditions and in hot, humid ones. The most interesting finding, though, was that local weather changes mattered more than absolute weather values. A sudden 20-degree temperature drop in California caused about the same increase in eczema activity as a 20-degree drop in the Midwest, even though the baseline climates are very different. In other words, your skin seems to react to change more than to raw temperature. Humidity behaved differently—it had a similar effect across regions, regardless of where someone lived. While the model could be improved by using finer-grained data, true humidity instead of precipitation, or anonymized medical records, it already shows that weather patterns and eczema are meaningfully connected.
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