Variable ID
RELH
Variable Type
Standard - Primary
Variable Category
Moisture
Standard Units
percentage
Description
The 5-minute average relative humidity at a height of 1.5 meters above the ground. Because of the sorption sensor's inherent inaccuracy at saturation, the mesonet restricts all readings above 100% to 100%.
- Relative humidity changes when either the moisture content of the air or the air temperature changes.
Accuracy
± 3% for 10–98%
Sensors
Vaisala HMP155 (2015–present)
Vaisala HMP45C (1994–2015)
Documentation Links
Sensor Image URL
https://content.prod.mesonet.org/repos/instruments/images/vaisala-hmp155.jpg
Sensor Image Alt Text
Vaisala HMP155
Sensor Image Caption
Vaisala HMP155