Definition
A weather sensor that measures both air temperature and humidity at one location and transmits those readings to a display in another location, allowing observers to read the values without being physically present at the sensor.
Plain English
A device that measures temperature and moisture in the air outside, and sends those numbers to a screen indoors so someone can read them from a distance.
Context Anchor
Seen in weather equipment descriptions, airport weather reporting, and maintenance notes for weather observing systems.
Derivation
Hygro- comes from Greek hygros meaning 'wet' or 'moist,' and thermo- from Greek thermos meaning 'heat.' A hygrothermometer measures both moisture and temperature. 'Remote reading' simply means the readout is in a different place from the sensor itself.
Why Pilots Care
Supplies accurate temperature and dew-point data used in METAR reports for flight planning and icing assessment.
Grounding Statement
The sensor can be outside in the actual air while the readout is inside where a person can safely and easily see it.
Intuition Check
Remote reading does not mean a person is far away guessing the weather. It means the sensor and the display are in different places.
Example Sentence 1
The field's RRH feeds current temperature and dew point into the hourly weather report.
Example Sentence 2
Before takeoff the pilot reviewed the latest RRH readings to confirm dew point spread.