United States Department of Agriculture
Natural Resources Conservation Service
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National Water and Climate Center

SCAN Sensors

All Snow Climate Analysis Network (SCAN) sensor measurements are reported hourly.

Element Measured Sensor Type Precision
Air Temperature Shielded thermistor 0.1°C
Barometric Pressure Silicon capacitive pressure sensor 1%
Precipitation Tipping bucket 0.01 inches
Relative Humidity Thin film capacitance-type sensor 1%
Snow Depth Sonic sensor (not on all stations) 0.5 inches
Snow Water Content Snow pillow device and a pressure transducer (not on all stations) 0.1 inches
Soil Moisture Dielectric constant measuring device. Typical measurements are at 2", 4", 8", 20", and 40" where possible. 0.5%
Soil Temperature Encapsulated thermistor. Typical measurements are at 2", 4", 8", 20", and 40" where possible. 0.1°C
Solar Radiation Pyranometer 0.01 watts per meter
Wind Speed and Direction Propellor-type anemometer Speed: 0.1 miles per hour Direction: 1°

SCAN Sensor Labels