What Is Dew Point?
The dew point is the temperature at which air becomes saturated and water vapour condenses into dew, fog, or clouds. A higher dew point means more moisture in the air.
Why Dew Point Beats Humidity
Relative humidity changes throughout the day as temperature shifts. The same amount of moisture gives 90% humidity at dawn but 40% by afternoon. Dew point stays constant, making it a more reliable comfort gauge.
Dew Point Comfort Scale
| Dew Point | How It Feels |
|---|---|
| Below 10°C | Dry, very comfortable |
| 10-15°C | Comfortable, pleasant |
| 16-18°C | Slightly noticeable |
| 19-21°C | Starting to feel sticky |
| 22-24°C | Muggy, uncomfortable for most |
| Above 24°C | Oppressive, tropical |
How Dew Point Forms Fog and Dew
When the air temperature drops to the dew point, moisture condenses. This is why dew appears on grass in the morning (ground cools to the dew point overnight) and why fog forms in valleys (cool air pools and reaches saturation).
Practical Uses
- Exercise planning: A dew point above 20°C makes strenuous outdoor exercise risky
- Travel comfort: Tropical destinations often have dew points above 24°C year-round
- Home comfort: Indoor dew points above 16°C may require dehumidification
Check current dew point and comfort levels on Weather Tomorrow.
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