Compare dry-skin seasons in two cities
See how indoor drying stress differs between two places across a typical year, using the Dry Skin Index for each area.
Phoenix has about 47 more dry-stress days a year than Chicago, including about 9 more Enhanced Care days.
Phoenix, AZ
Worst months reach Enhanced Care
- Annual average DSI
- 5.5
- Worst month
- January (7.5)
- Dry-stress days a year (DSI 4+)
- 340
- Enhanced Care days a year (DSI 6+)
- 105
- Dry season
- all year
- Humidifier months
- January–February
Month by month
Chicago, IL
Worst months reach Enhanced Care
- Annual average DSI
- 5.2
- Worst month
- January (7.4)
- Dry-stress days a year (DSI 4+)
- 293
- Enhanced Care days a year (DSI 6+)
- 96
- Dry season
- September–May
- Humidifier months
- December–February
Month by month
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Know when your own area changes
These are typical seasons. Free Guide Lite follows this week's Dry Skin Index for your ZIP code and can send a short weekly email with one care tip.
Get my weekly skin-care forecastValues are modeled estimates of typical indoor drying stress for each metro area, simulated from 2025 local climatic data. They are not measurements of individual homes. Dry-stress days are days with a modeled Dry Skin Index of 4 or higher; Enhanced Care days are 6 or higher.