Estimate relative humidity using temperature and dew point. This free aviation weather calculator helps pilots better understand moisture conditions, cloud potential, and weather planning.
Enter temperature and dew point in Celsius to estimate relative humidity as a percentage.
This calculator uses a standard approximation based on temperature and dew point in degrees Celsius.
Relative humidity is the percentage of moisture in the air compared to the maximum amount the air can hold at the current temperature.
When relative humidity is high, the air is closer to saturation. That increases the likelihood of fog, clouds, and precipitation. When it is low, the air is relatively dry.
Relative humidity becomes higher, and the air is closer to saturation. That often means cloud, fog, or dew formation is more likely.
Under normal atmospheric conditions, dew point should not be higher than air temperature. If it is, the input is likely invalid.
No. Dew point is a temperature that reflects moisture content, while relative humidity is a percentage that depends on both moisture and air temperature.
It helps pilots understand atmospheric moisture, cloud potential, fog risk, and changing weather conditions that may affect flight operations.