RELH

Relative Humidity (1.5 m)

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.

Type	Sensor Used	Standards Units	Accuracy
Standard - Primary	Vaisala HMP155 2015-Present; Vaisala HMP45C 1994-2015, PDF	described as a percentage	±3% for 10 - 98

Vaisala HMP155 Sensor